House : North American Convolvulaceae 501 



lanceolate lobes, the lobes contracted below the middle, the mar- 

 gins undulate or subsinuately toothed, the middle lobe longest, 

 broadest below the middle and tapering to an acute or acuminate 

 apex, two of the lateral lobes arising from near the base of the 

 middle lobe, the other two entirely basal and often again some- 

 what l-2-lobed on the outer margin ; petioles shorter than the 

 blades: peduncles 3-6 cm. long, i-flovvered; pedicels about 2 

 cm. long, thickened above, especially in fruit, sharply angled but 

 not winged : sepals equal, I — 1.5 cm. long, oval or oblong, rounded 

 at the apex, margins scarious : corolla campanulate-funnelform, 

 yellowish-white, about 3 cm. long, the limb as broad, silky-hirsute 

 on the plicae without with blackish hairs, densely so in bud, the 

 strongly contorted anthers protruding or inserted : capsules glo- 

 bose, 1.5 cm. in diameter, topped by a quatrefoil, deciduous oper- 

 culum, with rounded lobes, thick and coriaceous in texture, the 

 walls of the capsules thin and submembranaceous, semitranslucent. 



Sonora : Agiabampo, Dr. Edward Palmer 781, 1894, type, 

 in the National Herbarium, sheets no. 208789 and 208 jyo. 



Morelos : Puenta de Ixtla, Rose & Hay 5320, July 4, 1901. 



Chiapas: San Vicente, Goldman 8 yi, April 20, 1904. 



The three specimens seen indicate a most remarkable range, 

 and the species will undoubtedly be found in many intervening 

 localities. The specimens from Morelos and Chiapas have the 

 lobes of the leaf-blades relatively shorter and broader than the 

 type specimens from Sonora. The leaf-outline is strikingly odd 

 and not closely simulated by any other known species of Opereu- 

 Una, except the next which may prove to be but an extremely 

 narrow-lobed variety of 0. Roseana. 



Operculina Roseana was described without name, in Contr. U. 

 S. Nat. Herb. I : 344. 1895, by Dr. J. N. Rose, for whom it is 

 now named. 



12. Operculina angustiloba sp. no v. 



Similar to O. Roseana, but more slender ; lea"f-blades more 

 elongate in outline, primarily 3-lobed, the middle lobe with 2 

 lateral lobes at or near its base, the lobes linear, entire, somewhat 

 emarginate, the middle lobe 3-5 cm. long, 1.5-2 cm. wide, the 

 lateral lobe 0.5-3 cm - lon g and usua,I y narrower than the middle 

 lobe with small lateral segments near the middle in addition to 

 those at the base : peduncles 6-8 cm. long, bracts linear-lanceo- 

 late, 5-6 mm. long ; pedicels thickened above, 2.5-4 cm. long : 

 sepals 10-13 mm. long, greenish, tinged with purple above: cor- 



