[taxon report][distribution map][all photos][line drawing]
Scientific Name: Hymenoxys vaseyi (A. Gray) Cockerell
Synonyms: Actinella vaseyi A. Gray; Picradenia vaseyi (A. Gray) Greene
Vernacular Name: Vasey's bitterweed
R-E-D Code: 2-1-3
Description: Perennial herb; stems one or a few from a branching base, 2-5 dm tall, glabrous or sparsely pubescent in the inflorescence; leaves once or twice parted into narrowly linear lobes; inflorescence corymbose (flat-topped); involucre of flower heads 8-10 mm tall, outer phyllaries united for 1/2 to 2/3 their length, inner phyllaries ciliate-margined and blunt to acute at the apex; flowers yellow, ray corollas usually as long as or longer than the length of the involucre; achenes appressed-hairy, pappus scales blunt or acute at the apex. Flowers August to October.
Similar Species: Hymenoxys richardsonii has pappus scales that taper to a fine point (acuminate) at the apex. Hymenoxys brachyactis is biennial with only one stem, has ray corollas shorter than the involucre, outer phyllaries united for 1/3 to 1/2 their length, and acute to acuminate pappus scales.
Distribution: New Mexico, eastern Doņa Ana and eastern Sierra counties, Organ and San Andres mountains.
Habitat: Dry sites with coarse soils in montane scrub and piņon-juniper woodland; 2,100-2,500 m (6,900-8,200 ft).
Remarks: This is a variable and infrequently collected species in need of additional study.
Conservation Considerations: Very little is known of its abundance and habitat requirements. It needs additional field studies.
Important Literature (*Illustration):
Cockerell, T. 1904. The North American species of Hymenoxys. Bulletin of the Torrey Botanical Club 31:461-509.
*New Mexico Native Plants Protection Advisory Committee. 1984. A handbook of rare and endemic plants of New Mexico. University of New Mexico Press, Albuquerque.
Information Compiled By:
Robert Sivinski, 1999