E-Flora BC: Electronic Atlas of the Flora of British Columbia

Dichanthelium acuminatum (Sw.) Gould & C.A. Clark
western witchgrass (tapered rosette grass)
Poaceae (Grass family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #3919)

E-Flora BC Static Map
Distribution of Dichanthelium acuminatum
Click here to view the full interactive map and legend
Details about map content are available here
New! Click on the map dots to view record details.

SUBTAXA PRESENT IN BC
Dichanthelium acuminatum var. fasciculatum

Species Information

Click on the image below to view an expanded illustration for this species.



General:
Perennial grass from fibrous roots, greyish-green; stems simple in spring, slightly to repeatedly branched and often prostrate-spreading in late summer, pimpled and soft-hairy, up to 50 cm tall.
Leaves:
Sheaths open; basal leaves different from the stem leaves, forming a winter rosette; blades densely long-hairy or short soft-hairy to smooth above or with only minute, blistery hairs on the margins, the upper blades of the spring stems larger than the basal, 5-12 mm wide, those of the branches reduced; nodes usually with a ring of spreading hairs subtended by a smooth band; ligules 2.5-5 mm long.
Flowers:
Inflorescence an open panicle, 3-9 (11) cm long and about as wide, the branches rough short-hairy, erect; spikelets 2-flowered, elliptical to egg-shaped, more or less short soft-hairy, about 1.5-2 mm long, the lower florets sterile, those on the branches slightly smaller and tending to be closed, self-fertilizing; lower glumes 1-nerved, sharp-pointed, rounded or sometimes irregular, about 0.5 mm long, the upper glumes short soft-hairy throughout, 7- to 9-nerved, rounded or blunt at the tips, about as long as the fruits at maturity; sterile lemmas short soft-hairy throughout, 7- to 9-nerved, rounded at the tips, about as long as upper glumes; fertile lemmas much hardened and faintly nerved; lodicules about 0.3 mm long, fan-shaped.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to dry shores, beaches, open woods, meadows and bogs in the lowland and montane zones; fre quent in S BC to 53 degrees N and occasionally much farther north in association with hot springs; E disjunctly to PQ and NS and S to ME, MA, PA, NC, FL, MS, LA, TX, NM, AZ and CA.

Source: The Illustrated Flora of British Columbia

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References