img

Cyperus hypochlorus var. brevior

Kük. (1936)

This name is accepted

Kingdom: Viridiplantae Phylum: Magnoliophyta Class/Clade: Monocots Order: Poales Family: Cyperaceae Genus: Cyperus

‘ahu‘awa

Description

Key Characters:

Growth Form: Perennials with short, woody rhizomes clothed with dark reddish brown or purplish brown scales and their fibrous remnants.

Stems: culms stout, 50–130 cm tall, 5–16 mm in diameter near base, trigonous, smooth.

Roots:

Leaves: Leaves simple. Leaves several. Blades, linear, as long as or slightly longer than the culm, 3–7 mm wide, coriaceous. Margins entire. Sheaths dark reddish brown. Stipules absent.

Flowers: Flowers in inflorescences umbelliform, compound or partially compound, moderately dense, 5–18 cm long, 7–25 cm wide, rays 6–12, spreading, 3–16 cm long, once branched, each branch with 2–4 secondary rays, spikes cylindrical to oblong–elliptic, 2.5–4 cm long, 1.2–2 cm wide, densely bearing numerous spikelets, bracteoles setaceous, shorter than to as long as the subtending lateral spikes; involucral bracts 5– 10, the lower ones much longer than the inflorescence and up to 12 mm wide; spikelets usually 3–5–flowered, widely spreading to slightly reflexed, linear-lanceoloid, subterete, slightly turgid, 6–7 mm long, 1.5– 2.5 mm wide, rachilla broadly winged; glumes green and often tinged pale yellowish brown, chartaceous with hyaline upper margins, oblong-lanceolate or oblong–elliptic, 3.5–4.5 mm long, 1.5–2.5 mm wide, laxly imbricate, suberect but those in upper part of spikelet weakly spreading, 7–nerved or 9–nerved, midnerve prolonged into a minute recurved mucro. Flowers bisexual (perfect). Corolla (petals) absent. Stamens 3. Ovary superior; styles 5–6 mm long.

Fruit: Achenes oblong–ellipsoid; trigonous; 1.7–2 mm long; ca. 0.8 mm wide. Seeds 1; seed coat thin; free from pericarp; embryo basal; endosperm abundant.

Ploidy:

Habitat: Occurring in mesic forest.

Elevation Range: 350–760 m.

Historical Distribution

Uses and Culture

USES

Natural History

Statewide Status

Endemic

Island Status

Kaua'i Endemic
O'ahu Endemic
Molokai Endemic
Maui Endemic

Dispersal Agents


Pollinators

Bibliography

Name Published In: H.G.A.Engler (ed.), Pflanzenr., IV, 20(101): 409 (1936)

Other References

Wagner et al. 1990:1418 (K, O, Mo, M [as Mariscus hypochlorus subsp. brevior]); Tucker 1994:87/Wagner & Herbst 1999:1900 (Syn. M. h. subsp. brevior = C. h. var. brevior)

Occurrences

SNo. Scientific Name Locality Habitat Basis of Record Recorded By Record Number Island Source Date
1 Cyperus hypochlorus var. brevior Hamakua Preserved_Specimen Hillebrand, W.B. Maui BISH
2 Cyperus hypochlorus var. brevior ridge above Holt house Preserved_Specimen Meebold, A. 24960 Oahu BISH 1935-11-01
3 Cyperus hypochlorus var. brevior Waianae Mts, Mauna Kapu below dry ridge Preserved_Specimen Christophersen, E. 1542 Oahu BISH 1931-02-12
4 Cyperus hypochlorus var. brevior Waianae Mts, NW of Puu Kanehoa, Honouliuli grassy, dry Preserved_Specimen St.John, H. 14020 Oahu BISH 1934-01-07
5 Cyperus hypochlorus var. brevior W Maui, Lahaina District, ridge NE of Kauaula Valley; Kauaula/Manowaiopae Divide Colonizing recently burned areas with Dodonaea, Dianella, Pteridium, Melinis. Preserved_Specimen Oppenheimer, H.L. 100712 Maui BISH 2007-10-04
6 Cyperus hypochlorus var. brevior Mahanaloa Gulch Slightly upstream of Euphorbia haeleeleana exclosure; in a sloping dry terrain under a native canopy. Preserved_Specimen Obata, J.K. Kauai BISH 1991-07-10
7 Cyperus hypochlorus var. brevior West Maui, Paunau-Kuhua divide Acacia koa Preserved_Specimen St.John, H. 17703 Maui BISH 1936-12-19
8 Cyperus hypochlorus var. brevior upper Nihoa below road cut Bidens torta Preserved_Specimen Takeuchi, W.N. 2768 Oahu BISH 1986-08-22
9 Cyperus hypochlorus var. brevior Puu Kahili, Wahiawa, FR boundary road muddy road Preserved_Specimen Stone, B.C. 774 Kauai BISH 1955-06-15
10 Cyperus hypochlorus var. brevior W Maui, Lihau In grassland. Preserved_Specimen Hobdy, R.W. 3529 Maui BISH 1993-01-19
11 Cyperus hypochlorus var. brevior S ridge to Puu Hapapa talus rock; with Neraudia melastomifolia, Phytolacca octandra, Schinus Preserved_Specimen Takeuchi, W.N. 2802 Oahu BISH 1986-09-01
12 Cyperus hypochlorus var. brevior Koko Head edge of crater Preserved_Specimen Christophersen, E. Oahu BISH 1924-11-16
13 Cyperus hypochlorus var. brevior Waianae Range, Palehua rock, woods Preserved_Specimen Degener, O. 17623 Oahu BISH 1935-11-23
14 Cyperus hypochlorus var. brevior N Honouliuli bare dirt, moderate slopes; with Myrsine lanaiensis Preserved_Specimen Takeuchi, W.N. 3894 Oahu BISH 1988-07-17
15 Cyperus hypochlorus var. brevior W Maui, Wailuku District, Pohakea Gulch Uncommon on steep slopes in mesic forest. Vegetation: Metrosideros, Coprosma, Dodonaea, Myrsine, Dubautia, Pleomele, Leptecophylla, Wikstroemia, Bidens, Carex, Nestegis, Santalum, Alyxia, Freycinetia, Doodia, Sadleria, Dryopteris. Preserved_Specimen Oppenheimer, H.L. 110729 Maui BISH 2007-11-11
16 Cyperus hypochlorus var. brevior Waianae Mts, Palehua Preserved_Specimen Skottsberg, C.J.F. 300 Oahu BISH 1922-08-25
17 Cyperus hypochlorus var. brevior Kaluaa Preserved_Specimen Kondo, Y. Oahu BISH 1958-12-13
18 Cyperus hypochlorus var. brevior Palolo-Waialae ridge Preserved_Specimen MacDaniels, L.H. 494 Oahu BISH 1927-01-27
19 Cyperus hypochlorus var. brevior Kaluaaha Valley Preserved_Specimen Forbes, C.N. 343 Molokai BISH 1912-08-01
20 Cyperus hypochlorus var. brevior Waianae Mts., Kamaileunu ridge, separating Waianae Kai and Makaha Valleys Preserved_Specimen Wagner, W.L. 5094 Oahu BISH 1983-12-11
21 Cyperus hypochlorus var. brevior Waianae Mts., Palikea Preserved_Specimen Pearsall, G.A. Oahu BISH 1954-02-02
22 Cyperus hypochlorus var. brevior Waianae Range, Palehua Preserved_Specimen Maa Oahu BISH 1960-10-15
Back to Top