108 
BOTANY. 
acaulis, but the cauline or upper ones green and merely silky-pubescent, strongly punctate. 
Peduncles or naked branches 3 to 4 inches long, almost filiform. Head small, the involucre 
barely 3 lines in diameter. Rays 5 to 8, glandular-puberulent underneath. Pappus similar in 
the disk and ray ; the thin silvery scales very obtuse, marked with an indistinct mid-nerve, 
which is abruptly produced into a slender awn rather shorter than they, and a little shorter 
than the disk-corolla. Achenia silky-villous. The perennial root, thick caudices, and broader 
leaves, the lower at least appressed-silky and canescent, distinguish this from any form of A. 
linearifolia; the much smaller heads, the less silvery foliage, the acute receptacle, and the 
rounder palem of the pappus forbid its being viewed as an attenuated form of A. argentea. 
Actinella acaulis, Nutt. 1. c.; Torr. & Gray, FI. 2, p. 389. On the crest of the Sandia 
mountains, Hew Mexico ; October 10. The scape, 2 or 3 inches long, and seldom exceeding 
the linear silvery radical leaves, occasionally bears one or two similar leaves. 
Actinella scaposa, var. A glabra, Nutt. 1. c.; Torr. & Gray, l. c. Rocky ridges of the 
Antelope bills, on the Canadian ; September. This is the same as the A. scaposa var. mutica, 
Gray, PI. Fendl. p. 101 ; and the pappus is sometimes awnless, sometimes short-awned. It is 
without doubt the A. glabra of Nut tall, (whose specimen probably came from the same district, 
not from the Missouri,) but only a narrow-leaved and glabrate form of A. scaposa. 
Aciiyrach/ENA mollis, Schauer ; DC. Prodr. 7, p. 492. On plains, Benicia and lone valley, 
California ; April-May. 
Layia Calliglossa, Gray, PI. Fendl. p. 103. Calliglossa Douglasii, Hook. & Am. Bot. 
Beech, p. 356. Fields at Benicia, California ; April. 
Layia (Calichroa) platyglossa, Gray, l. c. San Francisco and Los Angeles, California; 
March—April. 
Layia (Callichroa) pentachieta, (sp. nov.): villoso-hispida ; foliis linearibus, inferioribus parce 
pinnatifidis, superioribus integerrimis ; pappo ex aristis 5 tenui-setiformibus lievibus ter se 
tequalibus achenio pubescente et fere corolla mquilongis. (Tab. XVI.) Hillsides at Knight’s ferry, 
on the Stanislaus, California ; May. This adds another to the already numerous species of this 
genus, which so closely resemble one another that they can scarcely, if at all, be distinguished, 
except by tbe pappus, or sometimes by the chaff of the receptacle. The present species falls 
naturally into the section Callichroa, and is only to be distinguished from the more slender 
forms of L. platyglossa, perhaps, by the rather smaller heads and less hairy achenia, but prin¬ 
cipally and surely by its pappus of only five longer and smooth awns. These are slender and 
bristle-like, naked, and only obscurely denticulate under a strong lens. Receptacle chaffy only 
at the very margin. Rays cuneate, yellow throughout. 
Layia (Madaroglossa) gaillardioides, Hook. & Am. Bot. Beech, p. 148 & p. 357. Napa 
Valley and Tamul Pass, California ; April. This is undoubtedly Hooker and Arnott’s species, 
on which the genus was originally founded. But there is seldom any chaff on the receptacle 
within the exterior disk flowers, so that it wholly falls into the section Madaroglossa. Its 
large rays trifid at the apex distinguish it from L. hieracioides. The fuscous pappus is villous 
with rather scanty wool only next the base. 
Layia (Madaroglossa) carnosa, Nutt, in Trans. Amer. Phil. Soc. 7, p. 393, <£ in Torr. & 
Gray, l. c. Sandy beach, Punta de los Reyes, California ; April. 
Layia (Madaroglossa) heterotriciia, Hook, dc Am., 1. c. ; Hook. Ic. PI. t. 326. Plains at 
Knight’s Ferry, on the Stanislaus, California ; May. 
Lagopiiylla dichotoma, Bentli. PI. Hartiu. p. 317 Plains of Feather river, near Marysville, 
California ; May. The rays are bright yellow. The genus is distinguished from Hemizonia 
by the obcompressed fertile achenia, completely enclosed by the subtending involucral scale, and 
by the cuneiform, deeply trifid rays. The habit also is peculiar. Yet the genus may perhaps 
pass into Hemizonia, although it is more distinct from it than Calycadenia is. 
Hemizonia luzulcefolia, DC. Prodr. 5, p. 692. Hillsides near Benicia, California; April. 
