164 PROCEEDINGS OF THE AMERICAN ACADEMY 



XIL 



contribution from the gray herbarium of 

 'harvard university. 



DESCRIPTIONS OF NEW PLANTS, CHIEFLY GAMOPET- 



ALJS, COLLECTED IN MEXICO BY C. G. PRINGLE 



IN 1889 AND 1890.* 



By B. L. Robinson. 



Presented by Sereno Watson, April 8, 1891. 



Xylosma Pringlei. Monoecious, glabrous, armed at the nodes 

 with simple acicular spines 3 to 5 lines in length : leaves small, fasci- 

 cled in the axils of the spines, coriaceous, elliptical, obtuse, attenuate 

 to a subsessile base, serrulate, veiny, shining above, pale beneath, 9 to 

 16 lines long by half as broad ; the edges more or less revolute and the 

 teeth incurved : flowers fasciculately grouped, 3 to G together, with no 

 common peduncle ; pedicels slender, 3 or 4 lines long : sepals 4, ovate, 

 acutish, scarcely exceeding half a line in length, glabrous or puberulent 

 on tlie outer surface, ciliate, minutely pubescent within : stamens 12 to 

 18, twice as long as the sepals: style 2-3-cleft, and the ovate ovary in- 

 completely 2-3-celled ; fruit not seen. — In the Sierra Madre near 

 Monterey, August, 1889 (n, 2784). This is perhaps the same as Dr. 

 Palmer's n. 10G2 (collected between San Luis Potosi and Tampico), 

 which differs principally in its ovate leaves and verrucose stem. 



Desmodium Jaliscanum, AVatson, var. (?) ohtusum. Stem 5 to 

 10 feet high : leaves elliptic, oblong, or even slightly obovate, very 

 obtuse, apiculate : calyx-teeth ovate, obtusish, the upper one refuse ; 

 pods appressed-pubescent, very numerous in dense simple or branched 

 racemes. — Rocky slopes, Tamasopo Canon, San Luis Potosi ; Octo- 

 ber, 1890 (n. 3290). 



PiMPiNELLA IMexicana. Glabrous : root more or less thickened ; 

 stem 4 feet high, with scanty foliage, panioulately branched above : 

 the radical and lower cauline leaves very long-petioled, ternate ; leaf- 



* Of tlie plants here described the last three only were sent from California 

 and Wasliington by other collectors. 



