182 PROCEEDINGS OF THE AMERICAN ACADEMY 



Nama. Its much divided leaves, however, would not go well in 

 that genus. 



Cordia alba, P. & S. Mr. Priugle'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 Cuha and Fendler's 

 921 from Venezuela. No. 3754 has short stamens and consider- 

 ably longer styles, thus representing the complementary form to 

 that of Ghieshrecht'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 in 

 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- 

 tuse, slightly mucronate, sessile, 12-15 lines long, 3-4 lines broad, 

 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 

 short, scarcely exceeding the calyx : nutlets ovate, more or less con- 

 spicuously keeled on the inner surface, usually only one maturing, 

 dark brown, shining, deeply pitted, becoming nearly 2 lines long. 

 — Limestone ledges, San Jose Pass, San Luis Potosi, July, 1890 

 (n. 3529). This plant considerably resembles L. Matamorense, DC, 

 but differs in its ligneous distinctly perennial base. Its stems are 

 rather more leafy above, the leaves less contracted at the base, and 

 the nutlets slightly larger. 



Lithospermum revolutum. Perennial : stems one or several 

 arising from a single thickish root, simple or somewhat branched, 

 pubescent, scabrous: lower leaves falling off; the middle and upper 

 stem-leaves thick, oblong or elliptic, entire, revolute on the edges, 

 rounded at the apex, sessile, very scabrous above, pubescent and 

 scarcely paler beneath, 1-2 inches long, 3-7 lines broad: inflores- 

 cence rather dense; bracts ovate, ciliate, acute, 4 lines long, not 

 equalling the calyx lobes; flowers short-pedicelled : calyx lobes 



* Different Forms of Flowers, pp. 117, 118 (orig. edit.). 



