232 H. D. House. . 
pedicels -2,5—3 cm long; sepals. subequal, orbicülar-ovate, 5-8 mm long, 
spreading in fruit; corolla tinged with magenta at the base, 6 cm long; 
limb 6—8 em broad with 5, rounded lobes, tube 12—15 mm thick; 
capsules thick-walled, oblong, 2. cm long and 1 em thick, 4-valved, 
2.celled; seeds twice as long as thick, with a long, white dorsal coma. 
.Mexico: Acapulco, Palmer; 482, 1894—95 (type — N, G). 
21. Ipomoea praecana J. D. House, Le, p. 227. | 
Stout, woody, perennial; stems densely canescent or silvery, furro- 
wed; leaf-blades orbicular, 8—12 cm‘ long, shallowly cordate, veins 5—7 
pairs, densely pubescent or nearly. glabrate above, silvery-pubescent 
beneath; petioles 3—5 cm long; peduncles shorter than the petioles, 
8-to 5-flowered; pedicels 5—10 mm long and 'with the calyx strongly 
-furrowed or wrinkled when dried; sepals 18—20 mm long, imbricated, 
canescent, obtuse, glabrous within; corolla subsalverform, 6—7,5 cm long, 
pubescent without, the tube' constriciéd and glabrous at the base; limb 
6—10 cm broad. 
Mexico: Oaxaca; Reyes, 2500-4000 ft. alt. E. W. Nelson 1823, 
Oct. 20, 1894 (type — N, G). Morelos; Near Cuernavaca, on lava beds, 
Pringle 7229, 1896 (G). 
22. Ipomoea sabulosa J. D. House, 1. c., p. 228. 
Ipomoea pandurata Conzatti & Smith, Syn. Fl. Mex., III; 48. 1895. 
Resembling Ip. pandurata (L.) G. F. W. Mey; perennial from a tuberous 
root; foliage minutely pubescent; leaf-blades ovate, acuminate, shallowly- 
cordate or subtruncate, 5—8 cm long; peduncles 1-to 3-flowered, the 
subulate bracts 5—8 mm long and often not opposite when the peduncle 
is 1-flowered; outer sepals about 10 mm long, acute, pubescent, inner 
ones 12—14 mm long by 3-4 mm wide, obtuse and submembranaceous; 
corolla 5.—6 cm long, constricted within the calyx, creamy-white with 
magenta base; limb 6—7 cm broad with 5, rounded lobes. 
Mexico: Oaxaca; Jayacatlan, Rev. L. C. Smith 142, 1894 (type G). 
San Luis Potosi; Villar, Pringle 5473, 1893 (G). 
23. Ipomoea sabulosa var. mollicella J. D. House, l. c., p. 228. 
Leaf-blades entire or hastately lobed; softly and densely velvety- 
canescent; sepals 10—12 mm long. 
Mexico: Oaxaca, Cuesta de Dominguillo, 4000 ft. alt. Albert L. 
Smith 640, 1895 (type — G). 
24. Ipomoea sabulosa var. hirtella J. D. House, l. c., p. 228. 
Leaf-blades ovate to oblong-ovate, hirsute above with harsh. 
conspicuously whitish hairs, more densely so beneath; rarely glabrate 
above. 
Mexico: Chiapas, Near San Cristobal, 70GO—8000 ft. alt. E. W. 
Nelson 3281, 1895 (type — 233075 — N, G). . 
25. Ipomoea lacteola J. D. House, ]. c., p. 229. 
Ipomoea calophylla Wright; Griseb, Cat. Pl. Cub., 204. 1866. Not 1. 
calophylla Fenzl. 1845. 
Distribution: Cuba and Isle of Pines, 
