182 PROCEEDINGS OF THE AMERICAN ACADEMY 
Nama. Its much divided leaves, however, would not go well in 
that genus. ad 
Corpra ALBA, R. & 8. Mr. Pringle’s specimens of this species, — 
collected at Las Palmas, San Luis Potosi (nos. 3676 and 3754) have 
light yellow flowers as in Wright’s 425 from Cuba and Fendlers | 
921 from Venezuela. No. 3754 has short stamens and consider — 
ably longer styles, thus representing the complementary form to — 
that of Ghiesbrecht’s 832 and Wright’s 425 with exserted stamens — 
and short styles. Darwin* found the difference in the length of : 
the stamens in an undetermined Cordia very slight, the anthers ™ — 
both forms being ‘seated in the mouth of the corolla.’’? Here, how- 
ever, the difference is very noticeable, the stamens of the short — 
styled form being considerably exserted from the throat, although — 
not exceeding the limb of the corolla. : 
LITHOSPERMUM CALCICOLA. A cinereous perennial: a foot or more : 
in height, several-stemmed from a branching distinctly ligneous — 
base: stems covered with a spreading hirsute pubescence, subsimple — 
and naked below, branched and very leafy above: leaves elliptic, ob- a 
tuse, slightly mucronate, sessile, 12-15 lines long, 3-4 lines broad, — 7 
appressed-pubescent on both sides, white-punctate above; the upper — 
ones similar but somewhat smaller: flowers very small, ‘subsessile: : 
calyx segments lance-linear, densely hirsute, in anthesis scarcely : 
more than a line in length, in fruit 2-3 lines long: corolla very — a 
short, scarcely exceeding the calyx: nutlets ovate, more or less ¢OB : 
spicuously keeled on the inner surface, usually only one maturing, : 
dark brown, shining, deeply pitted, becoming nearly 2 lines re = 
— Limestone ledges, San José Pass, San Luis Potosi, July, 1390 
(n. 3529). This plant considerably resembles L. Matamorense, DC, 
but differs in its ligneous distinctly perennial base. Its stems ae 
rather more leafy above, the leaves less contracted at the base, 
the nutlets slightly larger. 
LitHOSPERMUM REVOLUTUM. Perennial: stems one or several 
arising from a single thickish root, simple or somewhat prancbed Pe 
pubescent, scabrous: lower leaves falling off; the middle and- upp ] 
stem-leaves thick, oblong or elliptic, entire, revolute on the edges ; 
rounded at the apex, sessile, very scabrous above, pubescent 
scarcely paler beneath, 1-2 inches long, 3-7 lines broad: inflores 
cence rather dense; bracts ovate, ciliate, acute, 4 lines long: not 
ae the calyx lobes; flowers short-pedicelled: calyx lobes 
* Different Forms of Flowers, pp. 117, 118 (orig. edit.). 
