536 PROCEEDINGS OF THE AMERICAN ACADEMY 



solitariis) capitatis involucellum completurn multifidum (lobis ex ovato 

 subulatis) subsuperantibus ; floribus albidis roseisque ; calycis dentibus 

 parvis obtusis ; fructibus 10-alatis, alis suberoso-scariosis maxime un- 

 dulatis ; semine ventre intus profunde excavato. — In volcanic ashes, 

 on dry hills in the high Sierra Nevada, at Sonora Pass, and above 

 Lake Mono, alt. 9-10,000 feet. Leaves and scapes emerging from 

 a subterranean creeping rhizoma ; the lamina of the former mostly 

 less than an inch in diameter, the divisions extremely crowded, the 

 ultimate lobes a line or rarely two lines long, oblong, obtuse, mucro- 

 nate. Scape commonly exceeding the leaves. Involucel nearly herba- 

 ceous. Pedicels extremely short. Fruit 3 lines long, with complete, 

 rather broad, white (or purplish-tinged) and much undulate wings : 

 vittae 3 in each interval and a few on the commissure. Seed deeply 

 excavated at the commissure, the cross-section strongly reniform, more 

 so than in C. monianus, &c. (noticed in PI. Fendlerianae, p. 57) ; so 

 that the fruit is decidedly campylospermous. 



Cymopterus fcexiculaceus, Nutt., as I suppose it to be, also col- 

 lected by Dr. Brewer in the Sierra Nevada, is almost equally campy- 

 lospermous. It is hoped that the primary divisions in this order may 

 yet be established upon other characters than the form of the seed. 



Cymopterus ? Nevadensis : depresso-caespitosus, glaucus, fere 

 glaber ; petiolis brevibus, basibus scarioso-dilatatis caudices breves ves- 

 tientibus ; lamina foliorum 3-7-partita, segmentis rigidis lato-lanceo- 

 latis cuspidati.>i, lateralibus raro 2-3-fidis; scapo (^ - ^-pollicari) 

 folia parum superante umbellam capitatam quasi simplicem gerente ; 

 involuccllis 4-5 lateralibus 3-fidis flores (flavidos ?) adaiquantibus in- 

 voluLTum simulantibus. — At and near the summit of JMount Dana, 

 one of the highest peaks in the Sierra Nevada, alt. 13,227 feet. In 

 flower only, the genus quite uncertain. Plant only an inch or two in 

 height, tufted. Leaves and scapes obscurely puberulent. Umbel 3 or 

 4 lines in diameter, composed of 3 to 5 subsessile umbellets, each 

 adnate to the base of a foliaceous 3-5-cleft involucel (the divisions 

 ovate) ; these involucels imitating a complete common involucre. 

 Pedicels scarcely any. Ovary showing obscure rudiments of wings. 

 Calyx-tt'ctli lanceolate-subulate. Styles long and slender. 



SPIIENOSCIADIUM, nov. gen. Angeliceanim. 



Calycis margo obsoletus. Petala spathulato-obcordala, cum lacinula 

 setaceo-acuminata inflexa. Styli tilit'ormes. Fructus cuneatus : meri- 



