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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 (EXTINCT?)

Occurrences

SNo. Scientific Name Scientific Name Authorship Locality Habitat Basis of Record Recorded By Record Number Island Source Date
1 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information On tussock in bog. PRESERVED_SPECIMEN st.john, h. collector number: 26078 Maui BISH 8/30/1957
2 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information PRESERVED_SPECIMEN Forbes, C. N. 57.M. Maui US 5/10/2020
3 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information PRESERVED_SPECIMEN wilkes explor. exped. s.n. Kauai US
4 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information PRESERVED_SPECIMEN a. s. hitchcock 14827 Maui US 9/24/1916
5 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information PRESERVED_SPECIMEN Hitchcock, A. S. 14827 Maui US 1916-00-00
6 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information On tussock in bog. PRESERVED_SPECIMEN St. John, H. 26078 Maui BISH 8/30/1957
7 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information PRESERVED_SPECIMEN Mann, H. 431 Maui BISH 2/6/1905
8 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information PRESERVED_SPECIMEN Hillebrand, W.B. s.n. Maui BISH
9 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information Open bog. PRESERVED_SPECIMEN munro, g.c. collector number: 423 Maui BISH 9/25/1916
10 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information PRESERVED_SPECIMEN rock, j.f.c. collector number: 8178 Maui BISH 8/8/1910
11 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information Open bog. PRESERVED_SPECIMEN Munro, G.C. 423 Maui BISH 9/25/1916
12 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information PRESERVED_SPECIMEN j. f. rock 8178 Maui US
13 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information PRESERVED_SPECIMEN h. mann & w. t. brigham 431 Maui US
14 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information PRESERVED_SPECIMEN c. n. forbes 57.m. Maui US
15 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information PRESERVED_SPECIMEN forbes, c.n. collector number: 57.m Maui BISH 5/1/1910
16 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information PRESERVED_SPECIMEN Rock, J. F. 8178 Maui US 8/10/2020
17 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information Top bog. PRESERVED_SPECIMEN Skottsberg, C.J.F. 750 Maui BISH 9/10/1922
18 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information PRESERVED_SPECIMEN mann, h. brigham, w.t. collector number: 431 Maui BISH
19 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information Open bog. PRESERVED_SPECIMEN munro, g.c. collector number: 621 Maui BISH 9/25/1916
20 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information PRESERVED_SPECIMEN Forbes, C.N. 57.M Maui BISH 5/1/1910
21 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information Open bog. PRESERVED_SPECIMEN Munro, G.C. 621 Maui BISH 9/25/1916
22 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information 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 3/7/1997
23 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information PRESERVED_SPECIMEN hillebrand, w.b. collector number: s.n. Maui BISH
24 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information PRESERVED_SPECIMEN meidell, j.s. oppenheimer, h.l. collector number: 194 Oahu BISH 3/7/1997
25 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information PRESERVED_SPECIMEN Rock, J.F.C. 8178 Maui BISH 8/1/1910
26 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information Closed Metrowideros forest, 8-12 m canopy. Understory dominated by Antidesma w/mixed wet associates, Syzygium, Broussaisia, Perrottetia, Cyrtandra spp, Psychotria spp, Dubautia spp, Labordia spp, Coprosma waimeae, Cheirodendron spp, Tetraplasandra PRESERVED_SPECIMEN skottsberg, c.j.f. collector number: 750 Kauai BISH 9/10/1922
27 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information Mixed ohia montane bog. PRESERVED_SPECIMEN J. Scott Meidell & Hank Oppenheimer 195 Maui PTBG 3/19/1997
28 Acaena exigua A.Gray Contact Bishop Museum Botany department for locality information Along ridge top, on soil. PRESERVED_SPECIMEN munro, g.c. collector number: 621 Oahu BISH 9/25/1916
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