164 PROCEEDINGS OF THE AMERICAN ACADEMY 
XI. 
CONTRIBUTION FROM THE GRAY HERBARIUM OF 
HARVARD UNIVERSITY. 
DESCRIPTIONS OF NEW PLANTS, CHIEFLY GAMOPET- 
AL4, COLLECTED IN MEXICO BY C. G. PRINGLE 
IN 1889 AND 1890.* 
By B. L. Rosryson. 
Presented by Sereno Watson, April 8, 1891. 
XyLosma Prinetet. Monecious, 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 6 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 the 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 nea 
Monterey, August, 1889 (n. 2784). This is perhaps the same as Dr. 
Palmer’s n. 1062 (collected between San Luis Potosi and Tampico), 
which differs principally in its ovate leaves and verrucose stem. 
Desmopium Jauiscanum, Watson, var. (?) optusum. Stem 5 to 
10 feet high: leaves elliptic, oblong, or even slightly obovate, very 
obtuse, apiculate: calyx-teeth ovate, obtusish, the upper one retuse ; 
pods appressed-pubescent, very numerous in dense simple or branch 
racemes. — Rocky slopes, Tamasopo Cafion, San Luis Potosi; Octo 
ber, 1890 (n. 3290). 
PimpPtneLta Mexicana. Glabrous: root more or less thickened; 
stem 4 feet high, with scanty foliage, paniculately branched above‘ 
_ the radical and lower cauline leaves very long-petioled, ternate ; leaf- i 
sancti eu ete nc Moemmneee CN Gee Ua ee 
* Of the plants here described the last three only were sent from California — 
and Washington by other collectors. ae 
