OF ARTS AND SCIENCES. 87 



rather firm pellicle, as in several species of Gilia ; moreover, in no 

 species that I have examined is there any membranaceous margin, 

 still less a wing ; the slight border which sometimes gives an appear- 

 ance of one comes from the drying of the somewhat ti-anslucent 

 mucilaginous coating. The characters which distinguish Gilia, Pole- 

 monium, and Loeselia are by no means as definite as was supposed 

 before such connecting forms as these and the preceding were known. 

 But I conclude that these two plants must coustitute a section of 

 Loeselia. 



^ Lachnostoma hastulatum. Gracillimum, volubile, pube densa 

 brevi undique cinereum ; foliis parvis (lin. 2-3 lougis et petiolo sub- 

 sequilongo) hastatis ; fioribus solitariis fere sessilibus ; sepalis lineari- 

 bus ; coroUae 5-partita3 lobis lato-linearibus tantum puberulis intus 

 glabrioribus ; corona simplici asclepioidea, nempe e squamis 5 cucuUi- 

 formibus apice tridentatis intus ligula brevi subulata auctis ; follicidis 

 fusiformibus parce molliter muricatis. — Caiion Tantillas, within the 

 nortliern borders of Lower California, Dr. Palmer. Corolla greenish- 

 white, only 2 lines long. Follicles nearly 2 inches long. 



Phacelia (Edphacelia) phyllomanica. Elata, ramosa, folio- 

 sissima, pube et brevi molli densa et superne longiore villosa canes- 

 cens ; foliis pinnatisectis, segmentis 17-25 crebris oblongo-linearibus 

 pinnatifidis, lobis brevibus oblongis nunc pauciden talis ; spicis thyr- 

 soideo-congestis primum densis ; floribus sessilibus ; calyce e phyllis aut 

 omnibus foliaceis pinnato-3-5-partitis aut 1-3 lato linearibus integer- 

 rimis corolla violacea parum brevioi'ibus ; jjlicis brevibus latissimis ; 

 staminibus subexsertis. — Var. interrupta : viridula, pube laxiore ; 

 foliis tenuioribus, segmentis paucioribus sparsioribus hinc inde ad lobu- 

 lum reductis, majoribus sinuato- vel crenato-bipinnatilobatis. — A 

 striking species of the P. tanacetifolia section, perhaps not an annual, 

 destitute of hispid hairs and of glands, but rather viscid in the inflo- 

 rescence ; the dissected foliaceous calyx peculiar. The annular disk is 

 very conspicuous. 



<^ Emmenanthe pusiLLA. Exigua, piloso-jmbescens ; foliis crassi- 

 usculis oblongo-lanceolatis vel spathulatis integerrimis in petiolum sat 

 gracilem attenuatis ; racemo 3-7-fioro laxo, primario scapiformi ; corolla 

 minima (alba?) sepalis linearibus parum spathulato-dilatatis capsula- 

 que ovoidea obtusissima mutica dimidio breviore ; stylo perbrevi ; 

 seminibus 10 valde grosseque rugosis Microgenetis. — Western Ne- 

 vada, at Steamboat Springs, S. Watson (part of No. 878, early young 

 plants confounded with Phacelia pusilla), and in the same district in 



