Euphorbia rockii

C.N.Forbes (1909)

This name is accepted

Kingdom: Viridiplantae Phylum: Magnoliophyta Class/Clade: Eudicot-Rosids Order: Malpighiales Family: Euphorbiaceae Genus: Euphorbia

‘akoko [akoko], ‘ekoko [ekoko], koko, kōkōmālei [kokomalei]

Description

Key Characters:

Growth Form: Compact shrubs or sometimes small trees 0.5–2 m tall, in protected sites up to 4 m tall, glabrous throughout.

Stems:

Roots:

Leaves: Leaves simple. Opposite, distichous. Blades narrowly oblong to narrowly oblong–elliptic or occasionally narrowly elliptic, (6–)8–14(–17) cm long, (1.5–)2–3.5(–4) cm wide. Apex obtuse to rounded, sometimes minutely emarginate. Base obliquely subcordate. Blades coriaceous. Margins entire. Petioles 0–1(–2) mm long. Stipules deltate, 2–3 mm long, weakly erose.

Flowers: Flowers in cyathia 3–10(–12) in branched, open to sometimes condensed, cymose inflorescences usually 2–6(–7) cm long, peduncles 3–10(–12) mm long, sparsely to moderately puberulent. involucre broadly campanulate, 1.5–2.2 mm high, 3.5–4.5 mm wide, puberulent, sometimes very sparsely so, the glands 5–6, greenish yellow, green, or red, upper surface glabrous, lower surface puberulent, occasionally with a white appendage. Flowers unisexual and highly reduced. Pistillate flowers solitary, on a gynophore; staminate flowers in 5 groups or cymules, each with 1 to several flowers. Calyx (sepals) absent. Corolla (petals) absent. Male flower reduced to a single stamen, with an articulation at junction of pedicel and filament, subtended by slender bracteoles. Ovary superior, 3-carpellate; ovules 1 per cell, anatropous.

Fruit: Capsules brilliant red; sometimes pink tinged red (and then perhaps not fully ripe); globose; 14–25 mm long and nearly so in diameter; glabrous; usually noticeably exserted from involucre; gynophores red; erect; exserted 1–4 mm from involucre; puberulent. Seeds brown to grayish brown; globose or broadly obovoid; 3.5–4 mm long; seed coat slightly wrinkled.

Ploidy:

Habitat: Wet forests.

Elevation Range: 600–830 m.

Historical Distribution

Uses and Culture

USES

Natural History

Statewide Status

Endemic

Island Status

Kaua'i Unknown
O'ahu Endemic

Dispersal Agents


Pollinators

Bibliography

Name Published In: Occas. Pap. Bernice Pauahi Bishop Mus. 4: 214 (1909)

Other References

Wagner et al. 1990:614 (O [as Chamaesyce rockii]); Govaerts et al. 2000:821/Yang & Berry 2011 (Syn. C. rockii = E. rockii)

Occurrences

SNo. Scientific Name Locality Habitat Basis of Record Recorded By Record Number Island Source Date
1 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Around perimeter and forming large mats in open bog area. Sprawling shrub, vining over uluhe cover, w/ Myrsine juddii, Viola oahuensis, ohia, Scaevola glabra. Preserved_Specimen Perlman, S. 5197 Oahu BISH 1987-02-08
2 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Brushy summit of range, very wet. Preserved_Specimen Fosberg, F.R. 8810 Oahu BISH 1916-10-16
3 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details In very wet Metosideros forest, with Labordia, Scaevola mollis, Broussaisia, Ilex, Cheirodendron. Preserved_Specimen Carlquist, S. 2196 Oahu BISH 1966-08-22
4 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details In moist rainforest. Preserved_Specimen Bryan Jr., E.H. 839 Oahu BISH 1934-10-14
5 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Windswept summit, low-growing wet forest. Preserved_Specimen Wagner, W.L. 5641 Oahu BISH 1985-09-08
6 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details In exposed rain-forest. Preserved_Specimen Degener, O. 8051 Oahu BISH 1932-06-17
7 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Upper moist woods. Preserved_Specimen St.John, H. 17977 Oahu BISH 1937-04-04
8 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Protected area on ridge. Preserved_Specimen Baker, R.J. Oahu BISH 1932-10-16
9 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Montane rain forest, low rainforest ridge area Preserved_Specimen Webster, G.L. 13820 Oahu BISH 1968-06-20
10 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Rock, J.F.C. 112 Oahu BISH 1908-11-14
11 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Rain-forest at summit. Preserved_Specimen Potter, C. 10292 Oahu BISH 1936-01-26
12 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Stemmermann, R.L. 1202 Oahu BISH 1976-10-30
13 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Obata, J.K. 1190 Oahu BISH 1968-07-21
14 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Kerr, M. 393 Oahu BISH 1946-01-12
15 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Lyon, H.L. Oahu BISH 1926-09-17
16 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Rock, J.F.C. 697 Oahu BISH 1908-12-03
17 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Kerr, M. 303 Oahu BISH 1949-09-09
18 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Faurie, A. 480 Kauai BISH 1910-02-01
19 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Rock, J.F.C. 112 Oahu BISH 1908-11-14
20 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Stone, B.C. 1136 Oahu BISH 1956-01-01
21 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Selling, O. 3687 Oahu BISH 1938-09-27
22 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Stone, B.C. 1136 Oahu BISH 1955-09-24
23 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Hosaka, E.Y. 313 Oahu BISH 1930-09-28
24 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Obata, J.K. 1796 Oahu BISH 1984-10-28
25 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Kerr, M. 30 Oahu BISH 1949-09-09
26 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Kerr, M. 393 Oahu BISH 1946-01-01
27 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Topping, D.L. 3271 Oahu BISH 1925-12-27
28 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Suehiro, A. Oahu BISH 1932-10-16
29 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Davis, H. Oahu BISH 1932-10-16
30 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Forbes, C.N. Oahu BISH 1909-05-08
31 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Forbes, C.N. Oahu BISH 1908-11-14
32 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Russ, G.W. Oahu BISH 1930-02-01
33 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Kerr, M. Oahu BISH 1945-09-09
34 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Kerr, M. Oahu BISH 1945-08-06
35 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Russ, G.W. Oahu BISH 1930-02-01
36 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Krauss, N.H. Oahu BISH 1932-10-16
37 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Forbes, C.N. Oahu BISH 1909-11-14
38 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Grant, M.L. 7565 Oahu BISH 1934-12-17
39 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen St.John, H. 10176 Oahu BISH 1930-01-19
40 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Sohmer, S.H. 6052 Oahu BISH 1969-09-06
41 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Skottsberg, C.J.F. 1846 Oahu BISH 1926-02-17
42 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Cowan, R.S. 954 Oahu BISH 1948-02-15
43 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Lyon, H.L. Oahu BISH 1926-09-17
44 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Rock, J.F.C. Oahu BISH 1914-11-01
45 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Rock, J.F.C. Oahu BISH 1914-11-01
46 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Forbes, C.N. Oahu BISH
47 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Forbes, C.N. Oahu BISH 1909-05-08
48 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Open rain-forest. Preserved_Specimen Degener, O. 12293 Oahu BISH 1939-03-23
49 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Wet, windswept ridge. Preserved_Specimen Fosberg, F.R. 13873 Oahu BISH 1987-05-23
50 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Wet forest Preserved_Specimen Hosaka, E.Y. 313 Oahu BISH 1930-09-28
51 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Exposed ridge, lee side. Preserved_Specimen Fosberg, F.R. 10291 Oahu BISH 1933-09-22
52 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Cloud zone, moist thicket on crest. Preserved_Specimen St.John, H. 20420 Oahu BISH 1943-12-12
53 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Occasional in moist thick forest. Preserved_Specimen Hosaka, E.Y. 2382 Oahu BISH 1938-09-27
54 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Wet ridge. Preserved_Specimen Inafuku, R. Oahu BISH 1930-09-28
55 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Boggy windswept plateau with summit association: Trematolobelia, Plantago, Camphusia, Metrosideros tremuloides, Labordia Preserved_Specimen Herbst, D.R. 1117 Oahu BISH 1968-05-27
56 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Crest of ridge, thicket. Preserved_Specimen St.John, H. 10578 Oahu BISH 1930-09-28
57 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Wooded stream bank Preserved_Specimen St.John, H. 10097 Oahu BISH 1929-11-30
58 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Rain forest. Preserved_Specimen Bryan Jr., E.H. 1053 Oahu BISH 1940-12-22
59 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details In rain-forest at summit. Preserved_Specimen Degener, O. 9965 Oahu BISH 1935-07-04
60 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Summit ridge. Preserved_Specimen Rock, J.F.C. 412 Oahu BISH 1908-12-03
61 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details On windswept summit. Preserved_Specimen Degener, O. 8039 Oahu BISH 1931-04-04
62 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Along wooded ridge near summit. Preserved_Specimen Usinger, R.L. Oahu BISH 1936-01-23
63 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Wet forest Preserved_Specimen Fosberg, F.R. 12958 Oahu BISH 1936-03-01
64 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details In woods. Preserved_Specimen Judd Jr., A.F. Oahu BISH 1933-11-19
65 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Rain forest. Preserved_Specimen Kuykendall, J.R. 118 Oahu BISH 1945-10-21
66 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Montane rain forest. At top of ridge, alt. 2200 ft; windswept scrub with Bidens, Vaccinium, Tetraplasandra, et al. Preserved_Specimen Webster, G.L. 13806 Oahu BISH 1968-06-20
67 Euphorbia rockii Locality redacted. Contact Bishop Museum Botany Department for details Wet woods. Preserved_Specimen Nakagawa, S. Oahu BISH 1930-09-28