268 PROCEEDINGS OF THE AMERICAN ACADEMY 



leaflet : flowers dioecious ; sepals of the fertile flowers very small : 

 stigmas short and rather thick ; achenes ovate, about a line long, un- 

 dulately ribbed, the ovate seed filling the cavity. — On pine plains at 

 the eastern base of the Sierra Madre, Chihuahua ; C. G. Pringle (n. 

 1181), Sept., 1887. 



Thalictrum Wrightii, Gray. Mr. Pringle also collected in the 

 Sierra Madre specimens of this species, which accord in every way 

 With Wright's original specimens from Sonora. It appears to be 

 clearly distinguishable from all forms of T. Fendleri by the very 

 prominent reticulate venation of the leaflets. 



Delphinium viride. Glaucous ; root rather thick, branching ; 

 stem about 2 feet high, glabrous : leaves pubescent, pedately cleft, 

 with segments acutely lobed, the upper distant, more deeply divided 

 and segments narrower: raceme few-flowered, the pedicels (1 or 2 

 inches long) glabrous or more or less reflexed-pubescent : calyx pu- 

 bescent, yellowish green, the lanceolate sepals 6 lines, and the stout 

 nearly straight spur about 10 lines long; petals purple, 3 lines long, 

 the lateral with an oblong-lanceolate entire or cleft villous blade : 

 capsules very finely pubescent : seeds large, marginately angled, with 

 a close dark and somewhat rugose testa. — On gravelly bluffs of 

 streams at the east base of the Sierra Madre, Chihuahua ; C. G. 

 Pringle (n. 1185), Sept., 1887. Peculiar in its green calyx and short 

 purple petals. 



Helianthemdm Pringlei. Puberulent throughout; stems her- 

 baceous, erect, a foot high, branching above : leaves oblanceolate, sca- 

 brous on the margin, an inch long by a line or two wide, the upper 

 much reduced : inflorescence open, the slender pedicels jointed usually 

 near the middle ; flowers perfect ; sepals 2 lines long or more, the 

 outer shorter and linear, the inner ovate, acute, purplish ; petals 

 broadly flabelliform, entire, 4 lines long : stamens 20 to 25 : capsule 

 triangular-globose, a little shorter than the calyx. — On pine plains at 

 the base of the Sierra Madre, Chihuahua; C. G. Pringle (n. 1186), 

 Sept., 1887. 



Helianthemum Chihuahuense. Villous throughout ; stems 

 also finely pubescent, numerous, herbaceous or somewhat woody at 

 base, 6 inches high : leaves oblong-oblanceolate, about 9 lines long by 

 2 broad, with much smaller ones fascicled in the axils : flowers in 

 short few-flowered axillary and terminal corymbs, on short pedicels, 

 jointed near the middle and bracteolate or at the base and naked, 

 perfect, dimorphous, the lower apetalous and octandrous, the upper 

 with emarginate petals (4 lines long) and 25 to 30 stamens ; sepals 



