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Comprehensive Description ( англиски )

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Agrostis humilis Vasey, Bull. Torrey Club 10: 21. 1883
Perennial; culms cespitose, slender, erect, 1-noded near the base, usually not more than 15 cm. tall; leaves mostly basal, the sheaths glabrous; ligule obtuse, about 1 mm. long; blades flat or folded, glabrous beneath, minutely pubescent on the upper surface, mostly less than 10 cm. long, about 1 mm. wide or often less; panicle narrow, purple, 1-3 cm. long, rarely longer, the branches appressed or somewhat spreading; glumes 1.5-2 mm. long, glabrous except the slightly scabrous tip of keels; lemma nearly as long as the glumes, awnless; palea about two thirds as long as the lemma.
Type locality: Mt. Adams, Washington {Howell 85).
Distribution: Bogs and alpine meadows at high altitudes, Wyoming to Washington and Oregon.
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библиографски навод
Albert Spear Hitchcock. 1937. (POALES); POACEAE (pars). North American flora. vol 17(7). New York Botanical Garden, New York, NY
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North American Flora

Physical Description ( англиски )

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Perennials, Terrestrial, not aquatic, Stems nodes swollen or brittle, Stems erect or ascending, Stems caespitose, tufted, or clustered, Stems terete, round in cross section, or polygonal, Stem internodes hollow, Stems with inflorescence less than 1 m tall, Stems, culms, or scapes exceeding basal leaves, Leaves mostly basal, below middle of stem, Leaves conspicuo usly 2-ranked, distichous, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath smooth, glabrous, Leaf sheath and blade differentiated, Leaf blades linear, Leaf blades very narrow or filiform, less than 2 mm wide, Leaf blades mostly flat, Leaf blade margins folded, involute, or conduplicate, Leaf blades mostly glabrous, Ligule present, Ligule an unfringed eciliate membrane, 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, Lower panicle branches whorled, Flowers bisexual, Spikelets laterally compressed, Spikelet less than 3 mm wide, Spikelets with 1 fertile floret, Spikelets solitary at rachis nodes, 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 equal to or longer than adjacent lemma, Glume equal to or longer than spikelet, Glumes 1 nerved, Lemmas thin, chartaceous, hyaline, cartilaginous, or membranous, Lemma 5-7 nerved, Lemma glabrous, Lemma apex truncate, rounded, or obtuse, 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, 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
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Missouri Botanical Garden
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USDA NRCS NPDC
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USDA PLANTS text

Agrostis humilis ( англиски )

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Agrostis humilis is a species of grass known by the common names of mountain bent grass[1] and alpine bentgrass, which can be found in Western United States and Canada.[2]

Description

The plant perennial and caespitose while it culms are 5–10 centimetres (2.0–3.9 in) long. The eciliate membrane have a 0.5–1 millimetre (0.020–0.039 in) long ligule which is also both erose and truncate. It have filiformed and flat leaf-blades which are 2–10 centimetres (0.79–3.94 in) long and 0.5–1 millimetre (0.020–0.039 in) wide. The panicle is inflorescenced and is 1.5–2.5 centimetres (0.59–0.98 in) by 0.5 centimetres (0.20 in) and is linear with the main branches being appressed. Spikelets are 2 millimetres (0.079 in) long and are both elliptic and solitary. They also carry both a pediceled fertile spikelet and one fertile floret which have a hairless callus.[3]

The glumes are 2 millimetres (0.079 in) long, lanceolate, membranous and have acute apexes. Fertile lemma is of the same size as glumes and is both elliptic and hyaline. It have hyaline palea which is 0.66–0.75 millimetres (0.026–0.030 in) long with rhachilla is extended at 0–0.15 millimetres (0.0000–0.0059 in). Flowers are membranous and 0.3 millimetres (0.012 in) long with two lodicules. They also have three stamens which are 0.6–0.7 millimetres (0.024–0.028 in) long with fruits being caryopses, having an additional pericarp and linear. hilum.[3]

Conservation

In California, the plant is considered endangered.[1]

References

  1. ^ a b "Agrostis humilis Vasey". CalFlora. Retrieved November 17, 2013.
  2. ^ "Alpine bentgrass". USDA. Plants Profile. Retrieved November 17, 2013.
  3. ^ a b W.D. Clayton; M. Vorontsova; K.T. Harman; H. Williamson (November 16, 2012). "Agrostis vinealis". The Board of Trustees, Royal Botanic Gardens. Kew: GrassBase. Retrieved November 17, 2013.

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Agrostis humilis: Brief Summary ( англиски )

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Agrostis humilis is a species of grass known by the common names of mountain bent grass and alpine bentgrass, which can be found in Western United States and Canada.

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Agrostis humilis ( португалски )

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Agrostis humilis é uma espécie de gramínea do gênero Agrostis, pertencente à família Poaceae.[1]

Referências

  1. «Agrostis humilis». Sistema Global de Informação sobre Biodiversidade (em inglês). Consultado em 28 de agosto de 2019

Bibliografia

  • Barrie, F. R. 2006. Report of the General Committee: 9. Taxon 55:796.
  • Brummitt, R. K. 1995. Report of the Committee for Spermatophyta: 43. Taxon 44:611–612.
  • Jarvis, C. E. 1991. Seventy-two proposals for the conservation of types of selected Linnaean generic names, the report of Subcommittee 3C on the lectotypification of Linnaean generic names. Taxon 41:552–583.
  • Leena Hämet-Ahti et al.: Retkeilykasvio. Helsinki: Luonnontieteellinen keskusmuseo, Kasvimuseo, 1998. ISBN 951-45-8167-9
  • Nicolson, D. H. 1999. Report of the General Committee: 8. Taxon 48:373–374

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Agrostis humilis: Brief Summary ( португалски )

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Agrostis humilis é uma espécie de gramínea do gênero Agrostis, pertencente à família Poaceae.

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Agrostis humilis ( виетнамски )

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Agrostis humilis là một loài thực vật có hoa trong họ Hòa thảo. Loài này được Vasey mô tả khoa học đầu tiên năm 1883.[1]

Chú thích

  1. ^ The Plant List (2010). Agrostis humilis. Truy cập ngày 6 tháng 6 năm 2013.

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Agrostis humilis: Brief Summary ( виетнамски )

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Agrostis humilis là một loài thực vật có hoa trong họ Hòa thảo. Loài này được Vasey mô tả khoa học đầu tiên năm 1883.

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