Geniostoma hosakanum

(Sherff) Byng & Christenh. (2018)

This name is accepted

Kingdom: Viridiplantae Phylum: Magnoliophyta Class/Clade: Eudicot-Asterids Order: Gentianales Family: Loganiaceae Genus: Geniostoma

kāmakahala [kamakahala]

Description

Key Characters:

Growth Form: Low–growing shrubs up to ca. 0.5 m tall.

Stems: Stems angled, many-branched, moderately to densely short–hispid or short–hirsute.

Roots:

Leaves: Leaves simple. Opposite. Blades elliptic, oblong–elliptic, elliptic–obovate, or elliptic–ovate, 1.5–5(–7) cm long, 1–2(–3.5) cm wide. Apex acuminate to abruptly short-acuminate. Base cuneate to rounded. Upper surfaces short–hispid along lower part of midrib or near margins at base, sometimes glabrous; lower surfaces short–hispid along veins; pale green on lower surface, coriaceous and rugose. Margins revolute and usually ciliate toward base. Upper surface with veins strongly impressed. Petioles 0.2–0.6 cm long, short–hispid. Stipules interpetiolar, may also be intrapetiolar, membranous, connate into a cup 5–6.5 mm long, distinct from petioles, short–hispid at base, caducous.

Flowers: Flowers in inflorescences terminal, flowers 7–20 in sessile cymes, pedicels 2.5–6 mm long, hispidulous, bracts linear–spatulate, 8–13 mm long, ± ciliate, bracteoles linear–filiform to filiform, 7–10 mm long, ± ciliate. Flowers bisexual (perfect) or functionally unisexual, actinomorphic. Calyx 5-merous, sepals united at base, lobes slightly unequal, oblong–lanceolate to linear–lanceolate, 10–14 mm long, 1.1–2.5 mm wide, imbricate, conspicuously 3–7–nerved, margins conspicuously ciliate, sometimes hispidulous throughout, inner surface of Calyx often with colleters at the base, margin mostly fimbriate. Corolla 5-merous, campanulate to rotate, yellowish orange, glabrous or sparsely hirsute, 15–20 mm long, the tube slightly flaring, 9–12 mm long; lobes the lobes narrowly deltate, 5–7 mm long, apex acute, imbricate or contorted in bud. Stamens 5, alternipetalous, attached to mouth of corolla, exserted, usually recurved after anthesis, glabrous or hairy; filaments mostly short; anthers 2-celled, introrse, connective often extended to form an apical appendage, opening by longitudinal slits. Ovary superior or partly inferior, carpels hairy or glabrous, glabrous or sparsely hirsute in the upper part, 2– or 3-locular, sometimes partitions imperfect in upper part of ovary; ovules numerous, amphitropous, placentation axile; style terminal, mostly short; stigma clavate, ellipsoid, to globular, sometimes ± oblong, about as large as ovary.

Fruit: Capsules broadly ovoid–trigonous; 10–13 mm long; 6–8 mm in diameter; 3–valved; valves conspicuously keeled in upper part; keel 1–1.2 mm wide; apex with a beak 2–3 mm long; septicidal to sub–septifragal; maturing to green; with or without a black–purple tinge; usually becoming brown–black when over–mature. Seeds brown; 0.8–1 mm long; ± winged at both ends or all around; embedded in juicy orange to red pulp; numerous; ellipsoid to subglobular; intruded on the hilar side; surface mostly minutely papillose to areolate; brown to black; endosperm thick; fleshy; oily; proteinaceous; with saccharose or hemicellulose; embryo small; straight.

Ploidy:

Habitat: Occurring on cloud swept summits in wet forest.

Elevation Range: 790–860 m.

Historical Distribution

Uses and Culture

USES

Natural History

Statewide Status

Endemic

Island Status

O'ahu Endemic

Dispersal Agents


Pollinators

Bibliography

Name Published In: Global Fl. 4: 145 (2018)

Other References

Wagner et al. 1990:859 (O [as Labordia hosakana]); Gibbons et al. 2012/Christenhusz et al. 2018:145 (Syn. L. hosakana = G. hosakanum)

Occurrences

SNo. Scientific Name Locality Habitat Basis of Record Recorded By Record Number Island Source Date
1 Geniostoma hosakanum Locality redacted. Contact Bishop Museum Botany Department for details Wind-swept summit. Preserved_Specimen Degener, O. 10542 Oahu BISH 1936-03-15
2 Geniostoma hosakanum Locality redacted. Contact Bishop Museum Botany Department for details Wet stunted forest. Preserved_Specimen Takeuchi, W.N. Oahu BISH 1985-04-01
3 Geniostoma hosakanum Locality redacted. Contact Bishop Museum Botany Department for details Metrosideros-Cheirodendron forest. Preserved_Specimen Grant, M.L. 7236 Oahu BISH 1934-08-07
4 Geniostoma hosakanum Locality redacted. Contact Bishop Museum Botany Department for details Wind-swept summit. Preserved_Specimen Degener, O. 10542 Oahu BISH 1936-03-15
5 Geniostoma hosakanum Locality redacted. Contact Bishop Museum Botany Department for details Windblown slopes of the low statured summit zone vegetation. Preserved_Specimen Takeuchi, W.N. Oahu BISH 1985-08-01
6 Geniostoma hosakanum Locality redacted. Contact Bishop Museum Botany Department for details Denuded ridge Preserved_Specimen Hosaka, E.Y. 679 Oahu BISH 1932-07-04
7 Geniostoma hosakanum Locality redacted. Contact Bishop Museum Botany Department for details Wind- and rain-swept summit. Preserved_Specimen Degener, O. 11553 Oahu BISH 1937-12-06
8 Geniostoma hosakanum Locality redacted. Contact Bishop Museum Botany Department for details With Camphusia, Trematolobelia, Scaevola gaudichaudiana, et. al. Preserved_Specimen Gillett, G.W. 1585 Oahu BISH 1964-05-29
9 Geniostoma hosakanum Locality redacted. Contact Bishop Museum Botany Department for details Metrosideros- Dicranopteris lowland wet shrubland with Machaerina, Sadleria, Wikstroemia, Broussaisia, Dubautia laxa, Ilex, Syzygium, Melicope, Phyllostegia, Clidemia, plants with fruit, and flower. Preserved_Specimen Perlman, S. 6595 Oahu BISH 1987-10-15
10 Geniostoma hosakanum Locality redacted. Contact Bishop Museum Botany Department for details In moist rain forest Preserved_Specimen Bryan Jr., E.H. 837 Oahu BISH 1934-10-14
11 Geniostoma hosakanum Locality redacted. Contact Bishop Museum Botany Department for details Exposed ridge. Preserved_Specimen Fosberg, F.R. 9729 Oahu BISH 1933-08-06
12 Geniostoma hosakanum Locality redacted. Contact Bishop Museum Botany Department for details In windblasted habitat Preserved_Specimen Takeuchi, W.N. 1749 Oahu BISH 1985-12-01
13 Geniostoma hosakanum Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Degener, O. 10152 Oahu BISH 1935-06-02
14 Geniostoma hosakanum Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Forbes, C.N. 1790 Oahu BISH 1912-04-26
15 Geniostoma hosakanum Locality redacted. Contact Bishop Museum Botany Department for details Rain forest Preserved_Specimen Morley, H. 71 Oahu BISH 1933-12-10
16 Geniostoma hosakanum Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Anderson, D. Oahu BISH 1939-02-05