Brachypodium arbuscula
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Brachypodium arbuscula |
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| Brachypodium arbuscula | ||||||||||||
| Gay ex bones |
Brachypodium arbuscula is a species of Zwenken ( Brachypodium ) within the sweet grass family (Poaceae).
description
Brachypodium arbuscula is a perennial, loose clump-forming grass with short underground runners. The shoots initially grow upright or arching, later lying down. The above-ground parts of the rung survive the unfavorable season and become older than a year. The stalks are branched at the base and at the middle node. The stalks reach heights of 25 to 50 centimeters, they have 12-23 knots. The nodes are almost bare, rarely sparsely hairy. The ligule is 1–2.2 millimeters long. The leaf blades are heaped in the upper part of the stalk, pale green to blue-green, rolled up in the bud position. The stalk leaves are 2.5–6 inches long and 2.5–5.5 millimeters wide. The upper side of the leaf is densely short-haired, the underside very densely spiky. The flower cluster protrudes only 1.5–6 centimeters from the uppermost leaf sheath, it is 4–6 centimeters long with 5–8 densely packed spikelets. The spikelets are (without the awns) 20–27 millimeters long, twisting, rarely laterally somewhat compressed, with 1–13 florets. The lower glume is 6–8 millimeters long, the upper 7.5–9 millimeters long with 0.2–0.7 millimeters long awn. The lemma has seven nerves, it is 11–12.5 millimeters long and has a 1–2.5 millimeter long awn. The anthers are 4–4.5 millimeters long.
The number of chromosomes is 2n = 18.
distribution
Brachypodium arbuscula occurs only on the Canary Islands Tenerife (Teno Mountains), La Gomera and El Hierro . The localities are all on the north or northeast side of the islands. The species colonizes steep rocky sites and cliffs there. It is part of the succulent vegetation of the lower and middle altitudes and extends from the coast to around 500 meters above sea level. It colonizes the more humid islands of the Canaries and where the more humid locations.
Taxonomy
This species was first described by Gay in Knoche: Vagandi Mos .: 272 (1923) as Brachypodium arbuscula . A synonym is Brachypodium ramosum var. Arbuscula (Gay ex Bone) St.-Yves .
Individual evidence
- ↑ a b c U.Schippmann: Revision of the European species of the genus Brachypodium. Boissiera 45, 1-249, 1991.
- ↑ Rafaël Govaerts (Ed.): Brachypodium arbuscula. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved June 19, 2020.