106 PLANTJE WRIGHTIANiE. VI. 



Ceepis ambigua, Graj/, PL Fendl. p. 114. On the sides of the Organ Moun- 

 tains, northeast of El Paso; April. (1427.) — The specimens exactly accord with 

 those of Fendler, except that the leaves and scape-like stems are rather more 

 setose. The plant (undistributed) which I enumerated under this name in AV right's 

 former collection (P/. Wright, p. 129) is very different, and a true Hieracium, 

 perhaps a less shaggy form of H. lougipilura. 



ADDENDA, 



Peganum Mexicanum, Gray, PI. Wright, p. 30, adn. Sides of the Chiricahui 

 Mountains, Sonora; Sept., in flower and fruit. (1428.) — The stems are numer- 

 ous from a deep and lignescent root, when old decumbent, attaining 10 or 12 inches 

 in length. Seeds narrowly clavate-oblong, slightly curved, with a closely alveolo- 

 late-reticulated testa. Embryo as in P. Harmala, but more slender. — The speci- 

 mens were misplaced and so overlooked at the time of the distribution. 



The following are described from specimens just received by Dr. Torrey, from 

 Dr. Parry of the Mexican Boundary Commission, who collected them last autumn 

 on the Rio Grande below New Mexico. 



Cowania eric^folia (Torr. in litt.): caule ramosissimo ; foliis parvis linearibus 

 margine valde revolutis cuspidatis subtus incanis ; calycis tubo breviter turbinate ; 

 petalis albis. — Crevices of limestone rocks on the Eio Grande, below Presidio del 

 Norte, Dr. Parry. — "A straggling bush, one or two feet high." Remarkable for 

 its Heath-like leaves, which are only two or three lines long. Flowers smaller than 

 in C. Mexicana. 



Laphamia bisetosa ( Torr. in Hit.): " pygmfea, suffruticulosa, subviscoso-puberula ; 

 foliis oppositis et alternis parvis ovatis vel obovatis in petiolum attenuatis subden- 

 tatis vel integerrimis resinoso-atomiferis punctatis ; capitulis solitariis sessilibus 

 6 - 8-floris ; ligulis nuUis ; acheniis puberulis margine Isevibus ; pappo e setis 2 

 corolla dimidio brevioribus." — Crevices of rocks in a caiion of the Rio Grande, 

 below Presidio del Norte \ Oct., Dr. Parry. — Plant many-stemmed from a thickened 

 and ligneous caudex, in the manner of the genus, from one to three inches high. 

 Leaves crowded, barely three lines long, and with a petiole of about two lines in 

 length. Head 3 or 4 lines long, terminating the short branches. Corolla 4-toothed. 

 Bristles of the pappus equal, rather stout, minutely scabrous. — This is the second 

 addition which Dr. Parry and Dr. Bigelow have made to this genus. It is the 

 more interesting, on account of its bisetose pappus and ievf flowers, as it narrows 

 the interval between the sections Monothrix and Pappothrix. 



Perityle Parrti (sp. nov.) : subviscoso-puberula ; foliis plerisque alternis reni- 

 formi-cordatis crebre dentatis nunc sublobatis ; ligulis lineari-oblongis discum 



