The Grass Genera of the World
The Grass Genera of the World | |
Named for M. Acosta-Solis, collector of the type specimen.
Sometimes referred to Digitaria or Panicum?
Habit, vegetative morphology. Slender perennial; densely caespitose. Culms 25–40 cm high; herbaceous. Culm nodes hairy to glabrous. Sheaths keeled above. Leaf blades narrow; 3–4 mm wide (7–13 cm long, narrowed to both ends); flat; without cross venation; persistent. Ligule a fringed membrane; very short.
Reproductive organization. Plants bisexual, with bisexual spikelets; with hermaphrodite florets.
Inflorescence. Inflorescence of spicate main branches; non-digitate. Primary inflorescence branches 3–4 (these appressed, rather distant, up to 4.5 cm long). Rachides neither flattened nor hollowed, not winged. Inflorescence espatheate; not comprising ‘partial inflorescences’ and foliar organs. Spikelet-bearing axes persistent. Spikelets solitary and paired; secund; pedicellate (the pedicels shorter than the spikelets).
Female-fertile spikelets. Spikelets 2–2.5 mm long; abaxial; compressed dorsiventrally; biconvex; falling with the glumes; with conventional internode spacings. The upper floret not stipitate. Rachilla terminated by a female-fertile floret.
Glumes present; one per spikelet (or the lower vestigial); (the upper) long relative to the adjacent lemmas; densely hairy; pointed (beyond the fruit); awnless; non-carinate. Upper glume 5 nerved. Spikelets with incomplete florets. The incomplete florets proximal to the female-fertile florets. Spikelets with proximal incomplete florets. The proximal incomplete florets 1. The proximal lemmas awnless; more or less equalling the female-fertile lemmas to decidedly exceeding the female-fertile lemmas (as long as the spikelet); densely hairy.
Female-fertile florets 1. Lemmas decidedly firmer than the glumes; smooth; entire; awnless; hairless; glabrous; non-carinate; having the margins inrolled against the palea; with a clear germination flap (?). Palea present; awnless, without apical setae. Ovary glabrous (?). Stigmas 2 (?).
Fruit, embryo and seedling. Fruit small (1.7 mm long).
Taxonomy. Panicoideae; Panicodae; Paniceae.
Distribution, ecology, phytogeography. 1 species; Ecuador. Glycophytic (riverbanks).
Neotropical. Andean.
References, etc. Morphological/taxonomic: Swallen 1968.
Special comments. Fruit data wanting. Anatomical data wanting.
This description is offered for casual browsing only. We strongly advise against extracting comparative information from it. This is much more easily achieved using the interactive key, which allows access to the character list, illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting specified attributes, summaries of attributes within groups of taxa, geographical distribution, classification, and species sampled for anatomy.
Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 1992 onwards. The grass genera of the world: descriptions, illustrations, identification, and information retrieval; including synonyms, morphology, anatomy, physiology, phytochemistry, cytology, classification, pathogens, world and local distribution, and references. Version: 6th June 2008. http://delta-intkey.com’.