168 PROCEEDINGS OF THE AMERICAN ACADEMY 
narrowly linear obtuse lobes; corolla blue and white, the lobes of the 
lower lip obovate-spatulate, longer than the very narrow upper lobes; 
capsule half-inferior. — Cool ledges and gravelly banks, Tamasopo 
Cafion, San Luis Potosi; October, 1890 (n. 3288). Resembles Z. 
Sartorii, Vatke (ex char.), but is distinguished by the elongated ra- 
cemes, and by the size, shape, and indentation of the leaves. 
NEMACLADUS OPPOSITIFOLIUS. Stems a foot high, much branched 
from near the ground; branches becoming erect from a decumbent base, 
usually simple, each bearing about six pairs of subopposite leaves, 
and then continued as a long naked racemose inflorescence: leaves 
petiolate, ovate, acuminate, rounded at base but inconspicuously decur- 
rent upon the petioles and stem, sharply dentate, smooth, 9 to 15 lines 
long ; petioles 2 or 3 lines in length ; bracts minute, awl-shaped, scarcely 
a line in length, the bractlets subtending the calyx similar ; pedicels 
not exceeding 2 lines long: calyx-tube short, rounded at base, the 
segments equal, awl-shaped, acute, a line long; corolla-tube not equal- 
ling the calyx-lobes, the lower lip consisting of two ovate spreading 
segments, much longer than the three upper lobes: stamineal column 
ascending against the upper lip of the corolla and then curved forward ; 
anthers stellately divaricate around the stigma, not at all appendaged: 
mature capsule nearly equalling the calyx-lobes, two-valved at the apex. 
— Dry calcareous bluffs near Cardenas, San Luis Potosi; October, 
1890 (n. 3300). This plant, which is identical with Dr. Coulter's 
n. 30, differs greatly in habit from the known species of Memacladus. 
It possesses, however, just the characters which distinguish this genus 
in such a marked manner; namely, the stellately divaricate anthers, 
and the division of the corolla into a three-Iobed upper lip and a two- 
lobed lower lip. The subopposite leaves appear to be anomalous 
among the Lobeliacee. 
SymprLocos Princrer. A small tree, 20 to 30 feet high; branch- 
lets and petioles covered with a very short rufous tomentum : leaves 
elliptical, varying from obtusish to abruptly acuminate, cuneate at base, 
sharply and regularly serrulate, subcoriaceous, green and glabrous 
above, slightly paler beneath and pubescent especially along the mid- 
rib, 25 to 4 inches long by 14 broad ; petioles 4 to 6 lines long : flowers 
usually aggregated by twos and threes, subsessile upon a scarcely dis- 
tinguishable common peduncle, occasionally solitary; calyx silvery- 
sericeous ; lobes ovate, rounded or more or less pointed at the apex; 
petals 5, broadly spatulate, coherent for a third of their length, either 
smooth or very minutely pubescent on the outer surface : stamens ob- 
securely 4—5-delphous, united high up, adnate to the corolla for half its 
