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Luzula hawaiiensis var. oahuensis

(O.Deg. & Fosberg) O.Deg. & I.Deg. (1957)

This name is accepted

Kingdom: Viridiplantae Phylum: Magnoliophyta Class/Clade: Monocots Order: Poales Family: Juncaceae Genus: Luzula

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Description

Key Characters:

Growth Form: Strongly to weakly cespitose perennial herbs.

Stems: Stems erect, inconspicuously striate, 0.8–70 dm long.

Roots: Fibrous root system.

Leaves: Leaves simple. Primarily basal, 1–2(3) per stem. Blades linear, 5–30 cm long, 1–10 mm wide. Apex mucronate. Margins densely pubescent, especially when young, often glabrate with age. Petioles absent. Stipules absent.

Flowers: Flowers (2)3–8(–10) in subglobose glomerules subtended by papery or scarious bracts, forming cymose, terminal inflorescences, sometimes with a smaller, lateral inflorescence at the next lower node in the axil of a single foliar bract 4–15 cm long, bracts subtending inflorescence 1–4, foliaceous, 2–10 cm long, shorter than, equaling, or slightly longer than inflorescence, each flower subtended by 2–3(4) acuminate bracteoles with laciniate to subentire margins. Flowers bisexual (perfect). Perianth parts pale yellowish brown to dark brown, linear, subulate, margins narrow, hyaline, outer ones 2.5–4.5 mm long, inner ones 2–3.5 mm long; stamens shorter than perianth. Stamens 6; anthers equaling or longer than filaments. Pollen grains remaining in tetrads, surrounded by a common exine. Ovary superior, sessile, 1-celled, placentation basal; ovules 3, anatropous; styles about as long as ovary.

Fruit: Capsules pale brown to reddish brown; glossy; trigonous; oblong or ovoid; shorter than perianth. Seeds red to dark brown; ellipsoid to ovoid; 1–2 mm long; surfaces rugulose; often with white micropylar caruncle and conical protuberance at apex.

Ploidy: 2n = 14*; 24* (H); 16* (O); 38*; 42* (K)

Habitat: Occurring in open or rocky sites; slopes; cliffs; and ridges; and open areas in mesic forest and shrubland; also in subalpine forest; shrubland; and grassland.

Elevation Range: 730–2,560 m.

Historical Distribution

Images

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Uses and Culture

USES

Natural History

Statewide Status

Endemic

Island Status

O'ahu Endemic

Dispersal Agents


Pollinators

Bibliography

Name Published In: O.Degener, Fl. Hawaiiensis: 5, index (1957)

Other References

Wagner et al. 1990:1455 (O)

Occurrences

SNo. Scientific Name Locality Habitat Basis of Record Description Recorded By Record Number Island Source Date
1 Luzula hawaiiensis var. oahuensis Waianae Mts. Pohakea Pass, Honolulu Tufts in turfy ledges, base of cliff. Preserved_Specimen St.John, H. 13153 Oahu BISH 1933-05-12
2 Luzula hawaiiensis var. oahuensis Puu Maialau, Honouliuli Forest Reserve Low growing shrubland mixed native/alien; Vaccinium dentatum, Metrosideros polymorpha, Vulpia bromoides, Agrostis avanacea, Nephrolepis exaltata, Viola chammissoniana subsp. Tracheliifolia, herbaceous perennial; all plants low growing, silvery pubescence along leaves, especially margins. Base of leaves red. Leaves brusing purple/red. Preserved_Specimen Ching-Harbin, S. 2021060803 Oahu BISH 2021-06-08
3 Luzula hawaiiensis var. oahuensis Waianae Mts Mossy, grassy, and summit. Preserved_Specimen St.John, H. 14023 Oahu BISH 1934-01-07
4 Luzula hawaiiensis var. oahuensis Puu Kanehoa, Waianae Mt. Honolulu Dry region. Preserved_Specimen Koike, M. Oahu BISH 1931-03-22
5 Luzula hawaiiensis var. oahuensis Waianae Mts., Puu Kanehoa On dry ridge. Preserved_Specimen Hosaka, E.Y. 371 Oahu BISH 1931-03-22
6 Luzula hawaiiensis var. oahuensis Mauna Kapu, Honolulu-Nanakuli divide, Waianae Mts Bare windswept ridge. Small tufts. Preserved_Specimen Fosberg, F.R. 13790 Oahu BISH 1937-05-02
7 Luzula hawaiiensis var. oahuensis Waianae Range, along n.e. slope of Mauna Kapu Open, dry, steep, highly exposed terrain, wth Metrosideros, native, and exotic. Plenty colony of raw 300 plants, healthy (after heavy seasonal rain) Preserved_Specimen St.John, H. 411 Oahu BISH 1979-02-25
8 Luzula hawaiiensis var. oahuensis Kanehoa Top of main ridge Preserved_Specimen Hume, E.P. 124 Oahu BISH 1931-03-22
9 Luzula hawaiiensis var. oahuensis Duport Trail, northern slope of Kaala, Oahu Grassy, rocky ridge. Preserved_Specimen Degener, O. 19429 Oahu BISH 1949-02-22
10 Luzula hawaiiensis var. oahuensis Northeast ridge of Puu Kanehoa, Oahu Mossy cliffs at summit. Preserved_Specimen Degener, O. 12698 Oahu BISH 1940-03-31
11 Luzula hawaiiensis var. oahuensis Halona above LLL, west of Palikea Mesic native/non native open ridge top. Dominated by thick Erharta stipoides. Psidium catleianum, Metrosideros polymorpha, Morella faya. Preserved_Specimen small stature cespitose herb, base of leaves red turning green towards tips. Leaves persistently pubescent even on older leaves. Ching-Harbin, S. 2022020201 Oahu BISH 2022-02-02
12 Luzula hawaiiensis var. oahuensis Waianae Mts., Dupont Trail to Puu Kaala Preserved_Specimen Krajina, V.J. 620225330 Oahu BISH 1962-02-25
13 Luzula hawaiiensis var. oahuensis Waianae Mts., S. Kaaikukai Gulch Dry Ridge Preserved_Specimen Wilbur, R.L. 522 Oahu BISH 1948-03-26
14 Luzula hawaiiensis var. oahuensis Waianae Mts., S. Palawai Gulch Preserved_Specimen Webster, G.L. 1383 Oahu BISH 1948-03-26
15 Luzula hawaiiensis var. oahuensis Palehua/Palikea Trail Preserved_Specimen Char, W.P. 214 Oahu BISH 1982-03-11
16 Luzula hawaiiensis var. oahuensis Up ridge on right side of head of Makua Valley, Oahu Among rocks and grass. Preserved_Specimen Degener, O. 10306 Oahu BISH 1932-06-26
17 Luzula hawaiiensis var. oahuensis Pua Kaua, Lualualei, N of Kaua, steep N facing slope Schinus, Melinis, Carex wahuensis, Carex meyenii, Luzula hawaiiensis, Eragrostis grandis, Lipochaeta tenuis, Dianella sandwicensis, Chamaesyce multiflora, Pittosporum confertiflorum, Zanthoxylum dipetalum, Alyxia oliviformis, Schiedea hookeri, S. ligustrina, Lepidium arbuscula, Artemisia Preserved_Specimen tufted Wood, K.R. 10644 Oahu BISH 2004-03-31
18 Luzula hawaiiensis var. oahuensis Northern summit of Puu Kanehoa, Oahu On mossy decaying rock banks. Preserved_Specimen Degener, O. 12725 Oahu BISH 1940-04-14
19 Luzula hawaiiensis var. oahuensis Waianae Mts., Honolulu, Puu Kaua, secondary rige east to peak Wind-swept ridge; semi-wet; rocky. Preserved_Specimen Chock, A.K. 149 Oahu BISH 1950-02-26
20 Luzula hawaiiensis var. oahuensis Palikea, Rocky region. Preserved_Specimen Parker 10675 Oahu BISH 1936-01-05
21 Luzula hawaiiensis var. oahuensis Waianae Mts, Huliwai-Ekahanui Rdg divide on N side of rdg nr summitt crest NR Dubautia Sherffiana, below steep rise to Summit Crest which runs Puu Kava to Puu Kanehoa, cloud forest on east side of peaks w/ Liparis, Labordia, Viola, Cyanea membranacea, Ohia, locally common Preserved_Specimen Perlman, S. 5242 Oahu BISH 1987-02-22
22 Luzula hawaiiensis var. oahuensis Puu Hapapa, Waianae Mts., Honolulu Turfy upper ridges Preserved_Specimen St.John, H. 10413 Oahu BISH 1930-03-16
23 Luzula hawaiiensis var. oahuensis Waianae Mts., Palikea, Mauna Kapu, dip betweeen 2 & 3rd peak to right of palikea - windward side moist - dry, exposed cliff side Preserved_Specimen Herbst, D.R. 169 Oahu BISH 1966-07-29
24 Luzula hawaiiensis var. oahuensis Summit ridge of Puu Hapapa on northern side, Oahu Among rocks in sun. Preserved_Specimen Degener, O. 12349 Oahu BISH 1939-06-04
25 Luzula hawaiiensis var. oahuensis Gulch north of middle ridge between Puu Kamaohanui and Puu Pane On rocks. Preserved_Specimen Degener, O. 10305 Oahu BISH 1932-06-11
26 Luzula hawaiiensis var. oahuensis Waianae Mts Mossy and grassy. Preserved_Specimen St.John, H. 14023 Oahu BISH 1934-01-07
27 Luzula hawaiiensis var. oahuensis Ridge directly north of Kaala Grassy, rocky, often cloud sweep ridge. Preserved_Specimen Degener, O. 11144 Oahu BISH 1937-03-26
28 Luzula hawaiiensis var. oahuensis Waianae summit ridge above Ekahanui. Mesic shrubland dominated by Metrosideros, Vaccinium, Lobelia, Polypodium, Asplenium, Dodonaea, Odontosoria, Campylopus, Aerobryopsis, and others. Also growing amongst wees such as Miconia crenata, Gamochaeta purpurea, and Schinus terebinthifolius. Preserved_Specimen Small plants in understory with separate male and female flowers. Leaves with cobwebby hairs congested at leaf base and along margins. Plants dark green. Thomas, M.K. 245 Oahu BISH 2022-02-02
29 Luzula hawaiiensis var. oahuensis Xeric ridgeline 0.7 km east of Kolekole Pass. Schofield Military Reservation Small Herb Preserved_Specimen Warshauer, F.R. 1033 Oahu BISH 1977-02-20
30 Luzula hawaiiensis var. oahuensis Ridge between Makaleha and Makua Valleys. Waianae Range Among rocks in open, windswept, grassy ridge. Preserved_Specimen Hatheway, W.H. 492 Oahu BISH 1950-12-14
31 Luzula hawaiiensis var. oahuensis Waianae Mts, Pohukea Pass, Honolulu Tufts in turfy ledger, base of cliff. Preserved_Specimen St.John, H. 13153 Oahu BISH 1933-05-12
32 Luzula hawaiiensis var. oahuensis East slope of Puu Kaua Rocky exposed ridge near top Preserved_Specimen Degener, O. 10676 Oahu BISH 1936-01-19
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