OF ARTS AND SCIENCES. 87 



ratluT (inn iicllicle, as in several species oi Gllltt ; moreover, in no 

 s{)eeie8 that I have examined is tliere any membranaceous marj^in, 

 still less a wing; the slight bonier which sometimes gives an apixar- 

 anee of one comes from the drying of the somewhat translucent 

 nnicilaginoiis coating. The characters which distinguish Gilitt, J'ole- 

 monium, and Lceselia are by no means as delinite as was supposed 

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

 But I conclude that these two 2)lants must constitute a section of 

 Lceselia. 



Lachno.stoma hastulatum. Gracillimuni, volubile, pul.c dcnsa 

 brevi undique cinereum ; foliis parvis (lin. '2-6 lougis et petiolo sub- 

 aiquilongo) hastatis ; Horibus solitariis fere sessilibus ; sepalis lineari- 

 bus; corolloe 5-partita3 lobis lato-linearibus tantum puberulis iniu.s 

 glabrioribus ; corona simplici asclepioidea, nempe e scpiamis 5 cuculli- 

 formibus apice tridentatis intus ligula brevi subulata auctis ; folliculis 

 fusiformibus parce molliter muricatis. — Canon Tantillas, within the 

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

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



Thacelia (Eupiiacelia) niYLLOMANiCA. Elata, ramosa, folio- 

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

 cens ; foliis pinnatisectis, segmentis 17-2-3 crebris oblongo-linearibus 

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

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

 omnibus foliaceis piunato-3-5-partitis aut 1-3 lato liuearibus integer- 

 rimis corolla violacea parum brevioribus ; plicis brevibus latissimis ; 

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

 foliis teuuioribus, 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- 

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

 very conspicuous. 



E.MMENANTHE pusiLLA. Exigua, piloso-pubesccDS ; foliis crassi- 

 usculis oblongo-lanceolatis vel spathulatis integerrimis in petiolum sat 

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

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

 que ovoidea obtusissima mutica dimidio breviore ; stylo perbrevi ; 

 seminibus 10 valde grosseque rugosis Microyenetis. — Western Ne- 

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

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



