tae magnae in intervallis una in commisuris 2; seminum 
superficiesanguste suleata; chrosomatum numerus7= 44. 
Plants low, shortly caulescent, the stems several, 12- 
30 cm. high from a very elongate, branched, fleshy cau- 
dex, glabrous except for the puberulent inflorescence : 
leaves ovate, 8-5 cm. long, 2-4 cm. broad, 2—8-pinnate, 
the ultimate divisions linear-filiform, 5-20 mm. long, 
about 0.5 mm. broad, shortly mucronate; petioles slen- 
der, 1-6 cm. long, narrowly scarious-sheathing, the cau- 
line leaves with conspicuous scarious sheaths and sessile 
reduced blades; peduncles mostly terminal, slender, 6— 
12 cm. long, puberulent beneath the umbel: involucre 
and involucel 0; rays 6-12, up to 1 cm. long, puberulent ; 
pedicels 1-8 mm. long, the outer fertile; flowers deep 
red-purple; styles about 0.5 mm. long, mostly erect: 
carpophore bifid: fruit ovoid, 5-7 mm. long, 8-5 mm. 
broad, truncate at apex, rounded at base, the ribs low 
and rounded, broader than intervals; vittae large, soli- 
tary in the intervals, 2 on the commissure; seed face 
narrowly sulcate: chromosome number 7 = 44. 
Tyre: Chihuahua: Municipio de Bocoyna, in wettest portions of 
grazed meadow with dark mucky soil, elevation ca 7300 feet, N of 
San Ignacio Arareco, EF. of Creel, 11 July 1974, Robert 4. Bye, Jr. 
6288 (GH: holotype; ECON, UC). It was collected also in similar 
habitats in the general vicinity of San Ignacio Arareco, SE or E of 
Creel, on 14 July 1971, Bye 1535 (ECON), 16 July 1972, Bye 2369 
(ECON), 5 July 1973, Bye 4150 (GH, UC), and 19 July 1973, Bye 
4272B (ECON, UC), 9 October 1975, Bye 7027 (UC) and 7034 
(ECON). 
The older Tarahumara of San Ignacio call this herb 
“*huve™” and ascribe medicinal properties to the distine- 
tive rhizome. It is ground, mixed with oil or fat, and 
rubbed on the affected parts of the body to treat rheuma- 
tism. Only a small piece of the rhizome is placed in a 
cavity in order to alleviate toothache, because it is said 
to be very strong. Some young Tarahumara in the San 
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