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Acaena exigua

A.Gray (1854)

This name is accepted

Kingdom: Viridiplantae Phylum: Magnoliophyta Class/Clade: Eudicot-Rosids Order: Rosales Family: Rosaceae Genus: Acaena

liliwai, nani wai‘ale‘ale [nani waialeale]

Description

Key Characters:

Growth Form: Small, tufted perennial herbs.

Stems: Principal stems densely leafy, 1–4 cm long, usually becoming embedded in bryophytes, flowering stems slender, 5–15 cm long.

Roots:

Leaves: Leaves compound (odd-pinnate). Alternate. Blades usually 1–2.5 cm long, those of flowering stems smallest, leaflets oblong–eltptic to narrowly ovate or narrowly obovate, leaflets 6–17, 0.1–0.3(–0.4) cm long, 0.1–0.2 cm wide, the terminal one much wider, 0.25–0.3 cm wide. Apex 2-lobed to several-lobed. Upper surfaces glossy; lower surfaces minutely whitish papillose. Margins revolute. Veins conspicuously impressed. Petiolate. Stipules present 0.7–0.8 cm long.

Flowers: Flowers in short, dense spikes 5–10 mm long. bracts oblong, 1.5–3 mm long; receptacle urceolate, the tube broadly ovoid to subglobose, 1.3–1.5 mm long, with several widely spaced spines ca. 0.4–0.6 mm long, also ± whitish setose. Flowers bisexual (perfect) or sometimes unisexual. Calyx of (3)4(–7) sepals; sepals ca. 1 mm long, caducous. Corolla (petals) absent. Stamens 2, exserted. Ovary superior, carpels 1–2, connate; style short; stigma prominent, plumose, thick, capitate and fimbriate.

Fruit: Achenes pale brown; conical; ca. 1 mm long; the surface with several inconspicuous longitudinal furrows.

Ploidy:

Habitat:

Elevation Range:

Historical Distribution

Uses and Culture

USES

Natural History

Statewide Status

Endemic

Island Status

Kaua'i Endemic
Maui Endemic

Dispersal Agents


Pollinators

Bibliography

Name Published In: U.S. Expl. Exped., Phan. 1: 498 (1854)

Other References

Wagner et al. 1990:1102 (K, WM); Meidell et al. 1998:6 (REDISCOVER/WM); Wood 2012:98/Wood et al. 2019 (EXTINCT); Mann 431 GH (K†, 1864); Meidell 194 BISH (M†, 1997)

Occurrences

SNo. Scientific Name Locality Habitat Basis of Record Recorded By Record Number Island Source Date
1 Acaena exigua Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Rock, J.F.C. 8178 Maui BISH 1910-08-01
2 Acaena exigua Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Rock, J.F.C. 8178 Maui BISH 1910-08-01
3 Acaena exigua Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Forbes, C.N. 57 Maui BISH 1910-05-01
4 Acaena exigua Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Mann, H. 431 Maui BISH 1864-01-01
5 Acaena exigua Locality redacted. Contact Bishop Museum Botany Department for details Preserved_Specimen Hillebrand, W.B. Maui BISH
6 Acaena exigua Locality redacted. Contact Bishop Museum Botany Department for details Top bog. Preserved_Specimen Skottsberg, C.J.F. 750 Maui BISH 1922-09-10
7 Acaena exigua Locality redacted. Contact Bishop Museum Botany Department for details Open bog. Preserved_Specimen Munro, G.C. 621 Maui BISH 1916-09-25
8 Acaena exigua Locality redacted. Contact Bishop Museum Botany Department for details On tussock in bog. Preserved_Specimen St.John, H. 26078 Maui BISH 1957-08-30
9 Acaena exigua Locality redacted. Contact Bishop Museum Botany Department for details Open bog. Preserved_Specimen Munro, G.C. 621 Maui BISH 1916-09-25
10 Acaena exigua Locality redacted. Contact Bishop Museum Botany Department for details Open bog. Preserved_Specimen Munro, G.C. 423 Maui BISH 1916-09-25
11 Acaena exigua Locality redacted. Contact Bishop Museum Botany Department for details Mixed O`hi`a montane bog, among bryophytes on an exposed bluff. Assoc. veg.: Metrosideros polymorpha, Oreobolus [furcatus], [Plantago] pachyphylla, Carex montis-eeka, Sadleria pallida, Schizaea robusta, Luzula hawaiiensis. Preserved_Specimen Meidell, J.S. 194 Maui BISH 1997-03-07
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