Overview

Distribution

Localities documented in Tropicos sources

Eragrostis atropioides Hillebr.:
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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© Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO 63110 USA

Source: Missouri Botanical Garden

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National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Global Range: Oahu, Molokai, Lanai, Kahoolawe, Maui, Hawaii
The inclusion of Oahu in the range of this species appears to be based on misidentified specimens. (J. Lau, 2003)

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Physical Description

Morphology

Physical Description

Perennials, Terrestrial, not aquatic, Rhizomes present, Rhizome elongate, creeping, stems distant, Stems nodes swollen or brittle, Stems erect or ascending, Stems caespitose, tufted, or clustered, Stems terete, round in cross section, or polygonal, Stem internodes solid or spongy, Stem internodes hollow, Stems with inflorescence less than 1 m tall, Stems with inflorescence 1-2 m tall, Stems, culms, or scapes exceeding basal leaves, Leaves mostly basal, below middle of stem, Leaves mostly cauline, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath smooth, glabrous, Leaf sheath hairy at summit, throat, or collar, Leaf sheath and blade differentiated, Leaf blades linear, Leaf blades 2-10 mm wide, Leaf blades mostly flat, Leaf blades most ly glabrous, Leaf blades scabrous, roughened, or wrinkled, Ligule present, Ligule a fringe of hairs, Inflorescence terminal, Inflorescence a contracted panicle, narrowly paniculate, branches appressed or ascending, Inflorescence solitary, with 1 spike, fascicle, glomerule, head, or cluster per stem or culm, Inflorescence branches more than 10 to numerous, Flowers bisexual, Spikelets pedicellate, Spikelets laterally compressed, Spikelet less than 3 mm wide, Spikelets with 3-7 florets, Spikelets with 8-40 florets, Spikelets solitary at rachis nodes, Spikelets linear, appressed on short pedicels, Spikelets all alike and fertille, Spikelets bisexual, Spikelets disarticulating above the glumes, glumes persistent, Spikelets disarticulating beneath or between the florets, Rachilla or pedicel glabrous, Glumes present, empty bracts, Glumes 2 clearly present, Glumes equal or subequal, Glumes distinctly unequal, Glumes equal to or longer than adjacent lemma, Glumes 1 nerved, Lemmas th in, chartaceous, hyaline, cartilaginous, or membranous, Lemma similar in texture to glumes, Lemma 3 nerved, Lemma glabrous, Lemma apex truncate, rounded, or obtuse, Lemma apex dentate, 2-fid, Lemma awnless, Lemma margins thin, lying flat, Lemma straight, Palea present, well developed, Palea membranous, hyaline, Palea shorter than lemma, Palea 2 nerved or 2 keeled, Palea keels winged, scabrous, or ciliate, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis, Caryopsis ellipsoid, longitudinally grooved, hilum long-linear.
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Dr. David Bogler

Source: USDA NRCS PLANTS Database

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Type Information

Type collection for Eragrostis atropioides Hillebr.
Catalog Number: US 101548
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Status verified by specimen annotations only
Preparation: Pressed specimen
Collector(s): W. Hillebrand
Locality: Sandwich Island., Hawaii, United States, Pacific Islands
  • Type collection: Hillebrand, W. 1888. Fl. Hawaiian Isl. 531.
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© Smithsonian Institution, National Museum of Natural History, Department of Botany

Source: National Museum of Natural History Collections

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Type collection for Eragrostis atropioides Hillebr.
Catalog Number: US 2891447
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Status verified by specimen annotations only
Preparation: Pressed specimen
Collector(s): W. Hillebrand
Locality: Sandwich Island., Hawaii, United States, Pacific Islands
  • Type collection: Hillebrand, W. 1888. Fl. Hawaiian Isl. 531.
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© Smithsonian Institution, National Museum of Natural History, Department of Botany

Source: National Museum of Natural History Collections

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Ecology

Habitat

Comments: Found in a variety of communities in dry, exposed areas. Woodlands communities include those dominated by Metrosideros polymorpha or Chamaesyce olowaluana. Shrubland communities include 'A'ali'i (Dodonaea) Montane Dry Shrubland, an open shrubland with a ground cover of grasses and herbs and rare/scattered trees throughout its upper range, as well as other open to dense shrublands of Dodonaea viscosa, Myoporum sandwicensis, Sophora chrysophylla, Styphelia tameiameiae, and Chenopodium oahuense. It can be a dominant species in native grassland communities, including Lovegrass/Mountain Pili (Eragrostis/Panicum) Montane Dry Grassland, which has a dense grass cover with scattered shrubs. 120-1920 m, most abundant above 1220 m.

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N2 - Imperiled

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NatureServe Conservation Status

Rounded Global Status Rank: G2 - Imperiled

Reasons: Oahu, Molokai, Lanai, Kahoolawe, Maui, Hawaii
The inclusion of Oahu in the range of this species appears to be based on misidentified specimens.
Not common on Molokai, Lanai, Kahoolawe, and Maui. Common on a portion of Hawaii Island (southwestern Maunakea and adjacent areas in the saddle between Maunakea and Maunaloa), but apparently absent from most other parts of the island.

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