Puccinellia parishii (Parish's alkali grass)

Puccinellia parishii (Parish's alkali grass)

Photograph by Daniela Roth (2021)
Family
POACEAE
Scientific Name with Author

Puccinellia parishii A.S. Hitchcock

Synonyms

NONE

Common Name
Parish's alkali grass
Rare Plant Conservation Scorecard Summary
Overall Conservation Status Documented Threats Actions Needed
WEAKLY CONSERVED

Water management/use. Livestock ranching/farming

Population trend monitoring, document threat imapcts (grazing, drought)


Description

Dwarf annual with 1 to many stems; leaf blades about 1 mm broad, flat or involute, short; culms mostly 5-15 cm tall; panicle narrow, few-flowered, the branches erect-appressed; spikelets 4-6 mm long; glumes shorter than the first floret, broad, strongly nerved, scarious-margined; florets 4-6 per spikelet, disarticulating above the glumes; lemmas about 2 mm long, obtuse to truncate, scarious and somewhat erose at the tip, pubescent on the mid and lateral nerves nearly to the apex, and on the intermediate nerves about half way. Flowers May to June.

Similar Species

Puccinellia distans and P. airoides can grow in the same habitat, but they are perennials, have wider leaves, and lack pubescence on the lemma nerves. Poa annua is a small annual with pubescence on the lemma nerves, but the leaves are wider and boat-shaped at their tips.

Distribution

New Mexico, Catron, Cibola, Grant, Hidalgo, McKinley, Sandoval, and San Juan counties; Texas, California, Arizona, and Colorado.

Habitat

Alkaline springs, seeps, and seasonally wet areas that occur at the heads of drainages or on gentle slopes at 800-2,200 m (2,600-7,200 ft) range-wide. The species requires continuously damp soils during its late winter to spring growing period. It frequently grows with Distichlis stricta (salt grass), Sporobolus airoides (alkali sacaton), Carex spp. (sedges), Scirpus spp. (bulrushes), Juncus spp. (rushes), Eleocharis spp. (spike rushes), and Anemopsis californica (yerba mansa).

Remarks

This species was proposed for Federal listing as endangered on March 28, 1994 (59 FR 14378), but the proposal was withdrawn on September 25, 1998 (63 FR 51329) due to the discovery of additional populations and a re-evaluation of threats to the species. It is known from 30 sites range-wide, 17 in New Mexico.

Conservation Considerations

Puccinellia parishii requires wet alkaline soils; activities that divert or dry up springs or seeps will destroy its habitat. It can persist at springs that have been severely impacted by livestock grazing and trampling.

Important Literature

Hitchcock, A.S. 1928. New species of grasses from the United States. Proceedings of the Biological Society of Washington 41:157-164.

*Hitchcock, A.S. and A. Chase. 1951. Manual of the grasses of the United States, 2nd edition. U.S. Department of Agriculture Miscellaneous Publication No. 200.

U.S. Fish and Wildlife Service. 1998. Endangered and threatened wildlife and plants; withdrawal of proposed rule to list the plant Puccinellia parishii (Parish's alkali grass) as endangered. Federal Register 63:51329-51332.

Information Compiled By
Charlie McDonald 1999; last updated 2021

For distribution maps and more information, visit Natural Heritage New Mexico