164 REPORT OF AN EXPEDITION DOWN THE 



.?. glabra, Nutt. I. c. Torr. and Gr. 1. c. Rio Zuni : September. 

 Hymenothrix ? Wrightii, Gray, PI. Wright. 2, p. 97. New Mexico : October 21 

 The particular station of this remarkable species is not recorded. The speci- 

 mens are scarcely more than afoot high, and the root seems to be annual : in all 

 other respects, except in the broader lobes of the leaves, the plant agrees with 

 Dr. Gray's description (1. c.) The marginal flowers appear somewhat bilabiate, 

 from the union (sometimes nearly to the summit) of the lobes of the corolla. 



Achillea millefolium, Linn. ; Torr. and Gr. Fl. 2, p. 409. Laguna, &c, October. 



.Irtemesia frigida, Willd. ; Torr. and Gr. FL 2, p. 424. On the ZuiTi moun- 

 tain : August. 



.1 dracunculoides, Pursh, Fl. 2, p. 521 : Torr. and Gr. 1. c. Tampai creek : 

 November. 



J3. Canadensis, Miehx. Fl. 2. p. 129 : Torr. and Gr. 1. c. San Francisco 

 mountain : October. 



Senecio Jilifolius, Nutt. in Trans. Amcr. Phil. Soc. (n. ser.) 7, p. 414 : Torr. 

 and Gr. Fl. 2, p. 444. On the Rio Zuni : August, September. 



Cirsium undulatwm, Sprcng. ; Torr. and Gray, F1.2, p. 45(i. Zuni mountain 

 and San Francisco mountain ; August, October. 



Stephanomeria runcinata, Nutt. 1. c. : Torr. and Gray. 1. c. New Mexico: 

 October 24. 



ASCLEPIADACELE. 



Jlsclepias oerticillata ^ ! leptophyll'a : stem slender, with several lines of pubes- 

 cence, otherwise glabrous, nearly simple; leaves verticillate in fours, narrowly 

 linear, somewhat revolute on the margin, green on both sides : the midrib under- 

 neath thick and prominent : peduncles pubescent, shorter than the leaves: um- 

 bels few-flowered : lobes of the corolla ovate ; hoods ovate on the back, the 

 horn sublate-falciform, exserted : gynostegium on a short stalk : follicles lance- 

 olate, slender, glabrous. Rio Laguna : August. A common New Mexican 

 plant, differing from A. verlicillata of the Atlantic States in its longer, broader, 

 and far less crowded leaves, fewer-flowered umbels, longer horns, shorter stipe 

 of the gynostegium, &c. 



.icerates deewtribens, De Caisne in D. C. Prodr. 8, p. 522, Torr. in Emory's 

 report. *1nantherix decumbens, Nutt. in Trans. Amer. Phil. Soc. (n. ser.) 5, p. 

 202. On the Rio I.aguna : October : in fruit. 



(rENTIANACrlL. 



Geritiana Saponaria vnr. puberula, Torr. and Graj . in Gray, Bot. N. Si. 

 puberula, Michx. San Francisco mountain ; October. 



Eustorna, Russeliuna, G. Don ; Griseb. in 1). C. Prodr. 9, p. 51. Lisianlkv* 

 glaucifolius , Nutt. in Trans. Amer. Phil. Soc. (n.ser.) 5. p. 197. Valley of the 

 Rio Grande : Julv. 



