1907] NEW CONVOLVULACEAE 413 
exceeding the subtending leaves, 13-25°™ long; bracts small or 
lacking; pedicels 1-3°™ long, somewhat thickened: sepals unequal, 
8-14™™ long, lanceolate, subcoriaceous, the outer shorter and with 
some slight scattered pubescence, the inner ones longest, glabrous, 
cuspidate-acute and scarious margined: corolla bright blue with a 
white tube, 5-7°™ long; limb as broad, subentire; tube broad and 
expanding campanulate from above the calyx: stamens unequal; 
anthers sagittate at base: stigma with two nearly distinct globose 
lobes; capsules ovoid, 2-celled, 4-seeded. 
Mexico: State of Coahuila, San Lorenzo Cafion, six miles southeast of 
Saltillo, Palmer 396, Sept. 21-23, 1904; type, sheets nos. 471266 and 471265 
in U. S. Nat. Herb. 
Related to I. Jaeta A. Gray, from which it differs by its much smaller corolla, 
longer peduncles, and more glabrous habit. 
Ipomoea Plumieriana, nom. nov.—Convolvulus coccineus hepta- 
phyllos, radice crassissima Plum. Cat. 1. 1703; Plum. Amer. 79. pl. 
go. jf. r. 1755 (excl. syn. Sloan, Browne and Pluk.). Convolvulus 
macrorhizos L. Syst.ed. X. 923. 1759; Sp. Pl. ed. 2, 223. 1762; Ders. 
in Lam. Encyl. 3:567. 1789. Ipomoea marcorhizos R. & S. Syst. 
4:211. 1819; Choisy, in DC. Prodr. 9:388. 1845; Urban, Symb. 
matt “35 359. 1902; not J. marcorhiza Michx. Fl. Bor. Am. 1:141. 
1803. Batatas macrorhizos G. Don, Gen. Syst. 4:261. 1838. Ipomoea 
heptaphylla Griseb. in Mem. Am. Acad. 8:(Pl. Wright.) 527. 1863; 
not I. heptaphylla Voigt. Hort. Suburb. Calc. 360. 1845, and others. 
—Glabrous, twining, stout, ro™ high or more: leaf-blade digitately 
7(rarely 5, 6, or 8)-divided; segments stalked, elliptical-oblong to 
lanceolate, broadest above the middle, tapering to an acuminate 
base, apex abruptly acuminate or nearly obtuse, membranaceous or 
chartaceous, 5-1o°™ long, entire; petioles usually a little shorter 
than the middle segment: peduncles shorter than the subtending 
petioles, 1-6°™ long, 1-1.5"™ thick, 2~10-flowered ; primary pedicels 
I-1.5°™ Jong, somewhat thickened in fruit: sepals unequal, the 
inner a little longer than the outer ones, suborbicular, 9~10™™ long: 
corolla scarlet, purple or purplish-red, 5°" long or less, dilated- 
campanulate above the calyx; tube about 20™™ thick: stamens 
15-25™™ long; anthers usually protruding: capsules twice as long 
as calyx, thickest above the middle, 2-celled, 4-seeded; seeds blackish, 
