June 9, [909 



Operculum pectinata sp. nov. 



Related to O. ornithopoda (Robinson) House. Steins rather 

 stout or sometimes slender, glabrous: leaf blades subentire, ii 

 ufarly pectinately lobed or toothed, the lobes acuminate with 

 toothed margins, subtruncate at the base, the apex acuminate 

 <>r caudate, 4 to 6cm. long and as broad; petioles shorter than 

 the blades: peduncles longer than the petioles, 1 to 5-flowered: 

 bracts lanceolate, scarious, deciduous, 4 to 5111m. long: sepals 

 orbicular-obovate, rounded at the apex, 12 to 14 mm. long, nearly 

 as broad: corolla white, campanulate-funnelform, 3 em. long or 

 less, 3 to 4 cm. broad, densely pubescent without in bud, less - - 

 on the plicae when expanded: capsule as in the related species. 



Mexico: Oaxaca — About Lagunas, /:. If. Nelson 2646, 

 June 5, 1S95 (type in the National Herbarium); San Luis Po- 

 tosi — Near Tancauhuitz, 1200 feet altitude, /:". //'. Nelson ?j6p, 

 June 1, [898 (sheet no. jjo,p20 in National Herb.). 



The combination Operculina codonantha (Benth.), made by 

 the writer (Bull. Torr. Club 33: 503. 1906), should be credited 

 instead to Hallier f. (Bot. Jahrb. 1.6: 550. 1893). 



Operculina grandiflora (Jacq.) 



Convolvulus grandiflorus Jacq. Hort. Vind. 15: 39. pi. 6p. 



1776. 

 Ipomoea latiflora R. & ,S. Syst. 4: 240. 1819. (excl. svn. 



Desr.) 

 Convolvulus ventricosus Bert.; Colla, Hort. Ripul. 37. 1824. 

 Ipomoea ventricosa G. Don, Gen. Syst. 4: 274. 1838. 

 Calonyction grandiflorum Choisy, Mem. Soc. Phys. Oeuey. 



<>: 442. 1833, as to Jacquin synonymy only. 

 Operculina ventricosa Peter, in Engler& Prantl, Nat. Pflan- 



zenfam. I Y '. l>u : 32. 1 891. 

 Misled by Choisy's mistake in assigning Jacquin's C.grand- 

 iflorus to Calotiyction y many authors since, including the writer 

 (Bull. Torr. Club \\ 1 : 591. 1904), have associated this plate of 

 Jacquin's and combination made by Choisy with Tpomoea tuba 

 (Schlecht.)G. Hon {Calonyction album (L.) House, to which the 

 plate bears some close resemblance. Grisebach, however, cor- 



