VEGETATION OF MOUNT HAMILTON. 93 
portant organ called the “horn” of the hood, are in no other 
respect different from the best types of the genus Asclepias, 
aud I am persuaded that in a natural system of plant classi- 
fication they must be restored to that genus. There is an 
older A. tomentosus of Elliott, which precludes the use of 
Dr. Torrey’s specific name for this one, given under Acerates. 
One tuft of the species was found at the very summit of 
Mount Hamilton, and no more was seen. 
142. Puuox gractiis (Dougl.), Greene, Pittonia, 1. 141. 
143. Cottomra GRANDIFLORA, Dougl.; Bot. Reg. t. 1174. 
A few robust specimens were observed on the dividing ridge, 
near the cottages. 
144. Giza muLticavuis, Benth.; Bot. Reg., under t. 1622. 
145. Gilia gilioides. Collomia gilioides, Benth, km 
146. Lryanraus picnoromus, Benth, 1. c. 
147. Lryanruus Liirtorus (Benth.), Greene, Pittonia, 
ii, 254. 
148. Lrnanruvs rites (Benth.), Greene, 1. c. 255. 
149. Nuemopsina INstGNis, Dougl., Journ. Hort. Soe. iii. 
319. 
150. Pracerra crrctnata (Willd.), Jacq. £ Ecl. 185, +. 
91. One of several quite different plants conventionally 
referred to this aggregate species. : 
151. Emmenantur penpuniritora, Benth. Trans. Linn. 
Soc. xvii. 281. Plentiful at the summit, and robust. 
152. Puacenta Brewert, Gray, Proc. Am. Acad. x. 317. 
Mt. Diablo is hitherto the only recorded habitat of this 
species; but it is no rarity in this range of mountains, and 
occurs near Santa Cruz and Monterey. 
158. Puacerra atsprpa, Gray, Syn. Fl. 161. Common. 
154. Paacenta ramostssmma, Dougl.; Linn. Trans. xvii. 
280. Only in shady places toward the Joaquin Springs. 
