132 



types seems to warrant the separation from each of at least one species. 

 My understanding of these four species is expressed in the following 

 key, to which I have added a list of the various specimens examined. 

 The collections studied were the Gray and National herbaria. 



* Stems not glabrous ; nopals lanceolate; acuminate, strongly -'-nerved ; capstih much 



shorter than the calyx. 

 — Stems glandular-pubescent ; petals longer than sepals; leaves narroic-channeled '; of more 



northern range. 

 Dry maria nodosa Engelm. PL Fendl. 12. 1849. 



SPECIMENS EXAMINED. 



Mexico : 



State of Chihuahua, near Chihuahua, C. G. Pringle (No. 581) October, 1885, and 

 (No. 716) October 15, 1886; also base of Sierra Madre (No. 1195), September 20, 

 1897; also at Cosiquiriachi, Dr. Wislizenus, June and July. 



State of Sonora, Los Pinitos, C. V. Hartman (No. 138), October, 1890. 



■+-*- Stems pubescent, rarely if ever glandular; often glabrate; petals shorter than the 



sepals; leaves flat; of different habit and more southern range. 

 Drymaria gracillima (Ileuisl.) Lose; D. nodosa ( f ) gracillima Hemsl. Diag. PL Nov. 

 2 : 22. 1879. 

 Although this form semis to be separable as a species from D. nodosa, I should state 

 that no two botanists have seemed to agree as to its position. Dr. Gray, who first 

 published upon it, says: 



From this [D. nodosa] No. 697 of Coulter's Mexican collection scarcely differs except 

 that the plant is less diffuse, the leaves nearly Hat, the alar pedicels blunter, and 

 the petals smaller, — differences which are likely to arise from station. 



Englemann. who described a number of species in this genus besides I), nodosa, 

 considered it a good species, naming it after T. Coulter, although his mime was nev r 

 published. He says of it: 



A small annual a few inches high, nearly related to D. nodosa but well distin- 

 guished by the erect growth, by the shorter 'flat linear (or almost linear-lanceolate) 

 leaves, short pedicels, and inclosed petals. 



Mr. Heinsley has followed an intermediate course, describing it as a variety of 

 D. nodosa. 



8PE< ' I M ENS KX A M I NED. 

 Mexico : 



State of San Luis I'otosi, Parry & Palmer (No. 60), 1878, type; /'*-.,/. (,'. Schaffner 



(No. 140), 1876, at least in part and No. 5 at least in part. 

 Leal del Monte, Sierra de Aguseo, altitude 2,500 meters, in gravelly soil, 



T. Coulter (No, 697) ; 

 Locality not given, C. (i. Pringle, September 8, 1896 (No. 6182). 

 State of Durango, Durango, Dr. Edward Painter, April to November, 1S1I6 

 (No. 912). 



* * Stems glabrous ; sepals ovate, obtuse, not strongly S-nerred ; capsule scarcely shorter 



or longer than the calyx. 

 — Internodes much longer than the leaves; bracts often longer than the pedicels ; sepals 



obtuse, clearly 8-uerred; petals shorter than the calyx; capsule as long as the calyx. 

 Drymaria tenella Gray, PL Fendl. 12. 1849. 



SPECIMENS EXAMINED. 



Mexico: 



State of Chihuahua, base of Sierra Madre, C. d. Pringle (No. 1194), September 

 21, 1887, and near Chihuahua (No. 5S1), October 2, 1885, and (No. 6180) 18117. 



