10 TRANSACTIONS OF THE [OCT. 3, 



CACTE^. 

 30. Eclmiocactus setispinus, Engelm. 



UMBELLIFER^. 



80. BoiuUsia lolata, Kniz &Pav. 



82. Apittm ecMnatum (Nutt.), Watson, Bibliog. Index, 

 Parti., 412. 



81. Apmm Popei (T. & G.), Gray. 



118. GlimTopliyUum frocwiibens (L.), Crantz, var. Teinturiei 

 (Hook.), Coulter & Rose. 

 120. Daucus pusillus, Michx. 



RUBIACE^. 



85. HousTOisriA Crofti^, n. sp. Annual; depresssed-spread- 

 ing from a slender, straight root ; stems about 25™"" long, 

 simple, or dichotomously branching, minutely scabrous ; leaves 

 5 to 10""" long, oblanceolate, tapering into a very short petiole, 

 revolute, obtuse ; petioles sparingly ciliate ; flowers white, 

 minute (about 3™™ long), sessile in the axils ; fruit didymous, 

 2mm higii^ short-stalked, clothed with short hairs ; calyx teeth 

 acute, about half the length of the corolla tube.. 



A diminutive species in the section of H. humifusa, Gray, 

 Syn. Flor. Gamopet., p. 25. 



26. Houstonia cmgustifolia, Michx. A branching form. 



76. Galium virgatmn, Nutt. A smoothish, thin-leaved form. 



COMPOSITE. 



53. Uupatormm Greggii, Gray. 



36. Eupatormm incarnahim, Walt. 



21. Liatris punctata, Hook, the var. y of Torrey & Gray, 

 having leaves ciliate with rigid hairs. 



54. Gymnos'perma corymhosum, DC. 



55. GuTiERREZiA Sarothr^ts (Purslu). (SoUdago Sarotlirce, 

 Pursh. Flor. Amer. Sept., ii., 540, 1814; Bracliyris Eutham- 

 i(By Nutt., Genera, ii., 163, 1818 ; G. EuthamUe, T. & G.) 



47. Heterotheca subaxillaris (Lam.). {Inula suhaxil- 

 laris. Lam., Diet, iii., 259, 1789 ; H. Lamarchii, Cass. 1823.) 



42. Chrysopsisvillosa{Y\XY&\\.),'^\\it., Mil', canescens (DC), 

 Gray. 



37. Ilaplopappus spinulosus (Pursh), DC. 

 144. A]3hanostep]ius humilis (Benth.), Gray. 



41. Aster multijiorus, Ait. 

 136. Erigeron tenuis, T. & G. 



