or ARTS AND SCIENCES : MAT 30, 1865. 647 



to B. microglossa, and, like that species, having an acute appendage 

 surmounting the branches of the style, and a very slender, subulate, 

 naked-pointed receptacle ! The rays are more apparent, the involucral 

 scales wider, and the pappus more slender and rough. 



Lastiienia (Monolopia) ambigua : gracilis, arachnoideo-lanata; 

 caule spithamajo ramoso ; foliis alternis spathulato-linearibus lanceo- 

 latisve subintegerrimis ; involucri angusto-campanulati squamis 8-9 

 acuminatis ultra medium connatis ; ligulis ovalibus brevibus ; corollis 

 disci tubo hirsutissimo, limbo sensim arapliato glabrato; acheniis linea- 

 ribus 5-gonis subglabris (exterioribus ad angulos hirtellis) nunc calvis 

 nunc fere omnibus pappo brevi e paleis tenuibus eroso-truncatis coro- 

 natis. — Near Fort Tejon, Dr. Van Horn, in coll. Brewer. Nearly 

 related to X. {Monolopia, Benth.) hahicefolia of Hartweg's collection, 

 which has a broader and more woolly involucre, disk-corollas with a 

 narrower tube which is villous only in a ring at the junction with the 

 broadly expanded limb, and hairy achenia, all, so far as known, desti- 

 tute of pappus. In the present species the discovery of the pappus, 

 conspicuous enough in some heads but wanting in others, confirms the 

 suspicion that the Monolopice are epappose Heleniece. 



HuLSEA ALGiDA : viscoso-villosula ; caule (spithamaio) folioso 

 monocephalo ; foliis lineari-lingulatis aut repando- aut laciniato-den- 

 tatis sessilibus, imis subspathulatis, basibus dilatatis scariosis apicem 

 caudicis crebre vestientibus ; capitulo maximo ; involucri squamis 

 linearibus apice attenuatis albo-lanatis ; ligulis 50 - 60. — High peaks 

 of the Sierra Nevada, on Mount Dana, at 11,500 feet, and Wood's 

 Peak, 10,500 feet. Stems several from an ascending caudex, leafy 

 nearly or quite to the head. Leaves 1^ to 3 inches long, 3 to 6 lines 

 wide. Head an inch in diameter. Achenia 3 to 4 lines long. Nearly 

 related to H. CaUfornica, of which I possess only a portion of an in- 

 volucre (which is similar) and some flowers and achenia, the latter much 

 smaller than in the present plant. 



HuLSEA VESTiTA : caulibus abbreviatis e caudice subterraneo erecto 

 folia conferta obovato-spathulata subintegerrima albo-tomentissima sca- 

 posque monocephalos gerentibus ; involucri squamis oblongo-linearibus 

 viscoso-pubescentibus; ligulis 20-30; pappi paleis conspicuis. — In 

 dry volcanic ashes, near the summit of a volcanic hill south of Lake 

 Mono, alt. about 9,000 feet. A remarkable species of this now well- 

 established genus. Leaves thickly coated with matted white wool 



