OF ARTS AND SCIENCES: JUNE 11, 1867. 351 



Lessingia leptoclada : floccoso-lanata, deraum glabrescens, haud 

 viscosa ; caule erecto virgato superne ramos floridos stepius corymbosos 

 filiformes proferentibus ; foliis infimis spathulatis subdentatis, superi- 

 oribus lanceolatis linearibusque integerrimis basi brevissirae sagittato- 

 adnatis, ramorum parvis nunc raris in bracteas subulatas transeuntibus ; 

 capitulis 5-20-fioris solitariis bi-quinisve ramulos seu pedunculos ter- 

 minantibus ; involucri squarais lanceolato-linearibus acutatis mucrona- 

 tis ; corollis consimilibus purpureis, limbo aequaliter 5-partito ; pappo 

 corollas tubum ada>quante ; radice (ut in omnibus sp.) annua. — Tres 

 forma? admodum diversas, ut videtur colligendas : — typica, 1 - 2-pe- 

 dalis, capitulis 18-20-floris ; involucro turbinato pluriseriali, squamis 

 exterioribus gradatim brevioribus ; ramis floridis gracillimis nunc sim- 

 plicibus apice 1 - 3-cepbalis, nunc proliferis pedunculis filiformibus 

 corymbosis. — Yosemite Valley, in sandy soil, Bolander. [And now 

 received from the collections of Bridges and Torrey, and in a collec- 

 tion from Dr. Kellogg, said to be from near San Francisco.] 



Var. microcephala : sesqui - bipedalis ; caule foliisque caulinis 

 (argute dentatis rigidioribus) denudatis leviter glanduloso-scabridis ; 

 ramis floridis filiformibus effuse paniculatis decompositis ; capitulis parcis 

 lin. 3 tantum longis involucro 5-floro ; turbinato. — On Bear Mountain, 

 Dr. Torrey, 1865. I take tins to be a form of L. leptoclada, probably 

 from a more exposed station, and with depauperated inflorescence. 



Var. tenuis : 3 - 7-pollicaris ; capitulis paucis 5 - 7-floris ; involucro 

 angusto e squamis paucioribus attenuatis minus imbricatis. — Yosemite 

 Valley, with the typical form, of which, as Mr. Bolander did not 

 distinguish the two, I infer it to be a remarkable depauperate state. 

 But Dr. Torrey, who likewise collected it, regarded the three plants as 

 wholly distinct species. Further observation will determine. The 

 corolla in all is apparently light purple or whitish, as in all the other 

 species except L. Germanorum, where they are yellow : the lobes 2 or 

 3 lines long, oblong, becoming linear, their margins induplicate in aesti- 

 vation up to the nerves (as in the others) : inner flowers at length 

 probably as large as the outermost : genitalia included : appendages of 

 the style tipped with a prominent cusp much exceeding the bristles. 



Corethrogyne spathulata : caulibus casspitosis decumbentibus 

 apice vel ramis paucis adscendentibus foliosis monocephalis ; foliis obo- 

 vato-spathulatis versus apicem serratis, superioribus ovalibus oblongisve, 

 summis in bracteas lineares transeuntibus ; capitulo pro genere maxi- 

 mo ; involucro hemisphaerico ; squamis linearibus vel subspathulatis 



