482 CocKERELL: NorTH AMERICAN SPECIES OF HYMENOXxYS 
* Hymenoxys canescens biennis (Gray) 
Actinella biennis Gray, Proc. Am. Acad. 13: 373. 1878. 
Picradenia biennis Greene, Pittonia, 3: 272 (excl. descr.). 
A tall xerophytic plant; base of stems not woolly, but with 
very numerous, much divided leaves, with linear segments. The 
foliage is not erect, as it is in A. Lemmoni, but divergent from the 
stem, with a strong tendency to curl, the whole appearance being 
very distinctive. The following particulars are based on a sheet 
(U. S. Nat. Mus. 27487), representing the original lot, Dr. Pal- 
mer’s 260, collected in 1877 at. Mokiak Pass, Arizona.* 
Root large, 8 mm. diameter; a single stout (about 7 mm. 
diameter at base) strongly reddened main stem, profusely branched 
from the base upwards, the whole plant about 5.5 dm. high, with 
over 40 heads; leaves strongly punctate, practically glabrous; basal 
leaves very numerous, 6 to 8 cm. long, the divisions linear, not 
over I.5 mm. wide; stem-leaves 3 to 5 cm. long, the divisions 
about 1.5 mm. broad: heads (excluding rays) about 15 mm. 
broad; rays deep ferruginous (probably originally yellow), large 
and conspicuous, 20 mm. long and about 6 broad; outer bracts 
14, strongly Aescanici narrow, pointed, with straight sides, ani 
*lamg Keddy $e indebted to oe I. M. eatann is determining he true ‘type e of 
A, biennis. He writes (/itt. Jan. 25, 1904) as follo 
**In looking up oe original Cangas on teh ‘Uctinella biennis, Gray, Proc. 
Am. Acad., xiii, 373, was based * * * I find that which seems to me to be a most 
unfortunate circumstance, namely: there are under the name Acfinella biennis ap- 
parently two species. The label for one of these is in the handwriting of Dr. Gray, 
the locality given is ‘Mokiak Pass, S. E. of St. George, Arizona,’ and this label 
also bears the original number of Palmer, No. 260. The second a bears a label in 
the saeco of Dr. Watson, and the locality given is, ‘ Mokiak Pass, N. W. 
Arizona.’ Although this second plant was passed upon by Dr. sa in his work for 
the Synoptical Flora, I should assume the other must be the one to regard as the type 
of the species 4. dennis, as it bears the original label in Dr. Gray’s own handwriting, 
and the specimen has the large rays, and moreover is the one Dr. Gray had in mind 
when writing the description for publication. 
‘The ecseiranes between the two specimens under No. 260 of Palmer, as I see 
them, are as follows 
1, Stem suberect, pes branched, 5 to 6 dm. high; heads large, including the rays 
3 . 
the rays 3 cm. or less in diameter ; involucre biseriate ; bracts shorter than in the 
preceding, and of essentially the same length, the inner obtuse or subtruncate.”” 
Of the above plants, No. 1 manifestly agrees with U. S. NV. M. 27487. 
