248 ANNALS NEW YORK ACADEMY OF SCIENCES 



145. Ipomoea purpusi sp. nov. 



Stems stout, perennial below, 1-several m. long, densely pilose; leaf-blades 

 broadly ovate, 5-8 cm. long, cordate, deeply 3-lobed, acuminate, densely appressed- 

 hirsute and green above, paler and densely pubescent beneath with less appressed 

 hairs; petioles shorter than the blades; peduncles longer than the petioles, 4-10 cm. 

 long, lanate above, 1- to 5-flowered; sepals oblong-lanceolate, acute and apiculate, 

 inner ones 8-10 mm. long, glabrous but cihate near the apex, outer ones shorter, 

 pubescent and ciliate; corolla broadly campanulate-funnelform, about 3 cm. long 

 and the limb as broad. 



Mexico: Zucuapan, Purpus 2213, 1906 (type — Y, N). 



146. Ipomcea collina House, Bot. Gaz. 43: 412. fig. 2. 1907. 



Petioles as long as the blades or shorter; peduncles stout, 1- to 5-flowered, 13-25 

 cm. long; sepals 8-14 mm. long, lanceolate, outer ones sparingly pubescent, inner 

 cuspidate-acute, glabrous; corolla purple, 5-7 cm. long. 



Type locality: Near Saltillo, Coahuila, Mexico. 

 Distribution: Kno^n only from the type locality. 

 Specimens examined: Palmer 396, 1904 (type — N, Y). 



147. Ipomcea gracilis R. Br. Prodr. 484. 1810. House, Torreya 7: 



37, 38. 1907. 



Convolvulus denticulatus'DesT. in liaTn.Encyc. S: 540. 1789. 



Convolvulus gracilis Spreng. Syst. 1: 604. 1825. 



Ipomoea denticulata Choisy in Mem. Soc. Phys. Genev. 6: 467. 1833. — G. Don, 



Gen. Syst. 4: 276.' 1838.— Choisy in DC. Prodr. 9: 379. 1845. 



Not I. denticulata R. Br. 1810. 

 Ipomoea littoralis Blume, Bijdr. 713. 1826.— G. Don, 1. c. 265. 

 Ipomoea cymosa Baker, Fl. Maurit. 208. 1877. 

 /pomaa ntco6artca Kurz, Jour. As. Soc. Beng. 45: 141. 1876. 

 Ipomoea choisiana W. F. Wight, Contr. U. S. Nat. Herb. 9: 298. 1905. 

 Ipomcea roseana House, Muhlembergia 3: 43. 1907. 



Perennial, glabrous, stems dark; leaf-blades ovate, cordate or cordate-hastate, 

 obtuse or acute, mucronulate, 3-8 cm. long; peduncles 1- to 5-flowered, rarely many- 

 flowered; sepals ovate, inner slightly longer, broad and rounded but minutely cuspi- 

 date at apex, outer ones narrower, lanceolate-oblong, acuminate-cuspidate, 6-8 mm. 

 long; corolla purplish-pink, 4-5 cm. long. 



Type locality: Cette espece a ^te trouvee par Commerson dans les 

 Isles Mah6, Sechelles & des trois Fr^res. (Desr.) 

 Distribution: Circumtropical. 

 Specimens examined: Mexico: Colima, Pa^w^r 575, 1890 (N); Costa 



