214 PROCEEDINGS OF THE AMERICAN ACADEMY 



Crepis Cooperi := Malacothrix crepoides Gray, in Pacif. R. R. 

 Expl. 12, p. 49, which is also no. 327 of Hall's Oregon collection. It 



3-5 gracilliniis subpersistentibus. — M. parvijloral Gray, in Proc. Am. Acad. 

 5, p. 163, non Benth. — Cape San Lucas, Lower California, no. 67, coll. L. J. 

 Xantus. 



H--I- Pappus exterior praster oenticulos minimos plane nullus. Capitula parva. 



6. M. SONCHOIDES Torr. & Gray, Fl. Spithamsea, fere glabra; dentibus 

 lobisve foliorum radicalium subspinuloso-apiculatis ; acheniis fere linearibus 

 15-costatis ob costas 5 pauUo majores suu-augulatis, apice baud contracto 

 denticulis minimis albidis circa 15 coronulato. — Leptoseris sonclwides Nutt. in 

 Trans. Amer. Phil. Soc. 1. c. p. 438. Malacothrix obtttsa Eaton, in Bot. King, 1. c. 

 quoad pi. Utah. — Upper Platte, Nuttall, Geyer (no. 40) ; Utah, S. Watson, 

 Lieut. Wheeler. 



7. M. OBTUSA Benth. PI. Hartw. Spithamsea ad sesquipedalem ; caulibus 

 saepius gracillimis amplius paniculatis subaphyllis ; foliis radicalibus priniuni pi. 

 m. albo4anuginosis lobis dentibusque obtusis ; acheniis obovato-oblongis ]3l. m. 

 15-costatis (costis secundariis aut prominulis aut fere evanidis), apice sub- 

 contracto annulo integerrimo. — M. parvijlora Bentli. I.e. est forma scaposa 

 microcephala. — California, common. In this species the capillary bristles of 

 the receptacle are often very evident, about twice the length of the akenes, 

 and deciduous with them, very fragile, resembhng bristles of the pappus. 



* * * Annuas, scaposre, platyphyllfe, involucro praecedentis, floribus purpureis 



albisve. Pappus nullus. — Anathrix. 



8. M. PLATYPHTLLA. Glaucoscens ; foliis dilatato-cmieatis venosis margine 

 inaequaliter subspinuloso-denticulatis ; scapo- nudo ultrapedali superne laxe 

 corymboso-ramoso polycephalo ; involucri squamis propriis ovato-oblongis, 

 accessoriis calyculi paucis brevibus. — S. E. California, in gravelly soil near 

 Eort Mohave, Dr. J. G. Cooper. 



* * * * Perennes vel biennes 1 basi nunc suffrutescentes. Receptaculura sub- 



alveolatum, alveolis dentatis. 



H- Albiflorae (nunc purpurascentes), glabrat^e, caulibus foliatis, capitulis SEcpius 

 paniculatis majusculis. — Leucoseris Nutt. 



9. M. SAXATALis. Tenuiter tomentulosa et glabrata, nunc fere glabra ; foliis 

 lanceolatis imisve oblongo-spathulatis nunc laciniato-pinnatifidis ; acheniis line- 

 ari-oblongis 10-costatis, coronula prominulo 10-denticulato. — M. saxatilis &, 

 M. commutata Torr. & Gra.y, I. c. Hieracium? Californicum T)C Sonchus? Cal- 

 ifornicus Hook. & Am. Leucoseris saxatilis & Ccdifornica Nutt. 1. c. — Santa Bar- 

 bara and southward. 



10. M. TENuiFOLiA Torr. & Gray, 1. c. & Bot. Mex. Bound, p. 106. Gla- 

 berrima vel mox glabrata ; foliis angustissime linearibus vel filiformibus saepe 3-5- 

 partitis ; capitulis paucis in pedunculis filiformibus ; acheniis obovatis, coronula 

 obscura. — Leucoseris tenuifolia Nutt. 1. c. ? — In the Botany of the Mexican 

 Boundary, I stated that " from three to five of the bristles of the pappus are 



