ROSE — MEXICAN AND CENTRAL AMERICAN PLANTS. 307 



4.5 cm. wide, deep green and glabrous above, slightly paler and with scattered hairs 

 beneath; scapes less pubescent than the petioles; cymes 3 to 9-flowered; pedicels 

 1 to 1.5 cm. long, glabrous; sepals lanceolate to oblong, 4.5 mm. long, glabrous, each 

 bearing 2 large apical tubercles; petals light blue, 9 to 13 mm. long; shorter fila- 

 ments glabrous; longer filaments pubescent, each with an appendage on the back 

 near the base. 



Type collected at Tlalnepantla, Federal District, Mexico, July 5, 1898, by G. G. 

 Pringle (no. 6895). 



POLYGAIACEAE. 



TWO NEW SPECIES AND A NEW NAME IN POLYGALA. 



Polygala conzattii Rose, sp. nov. 



Slender, at least 40 cm. high, doubtless much higher, clothed with short crisp hairs; 

 leaves scattered, shortly oblong, 2 cm. or less long, obtuse, mucronate, narrowed at 

 base into a slender distinct petiole, sparsely pubescent; inflorescence a slender elongate 

 raceme bearing scattered flowers; bracts subtending flowers small, ovate, puberulent 

 on the back, persistent; pedicels 3 to 4 mm. long, in age reflexed; flowers pinkish; 

 sepals glabrous, the upper one persistent; upper petal not crested; fruit orbicular or 

 sometimes broader than long, 3 to 4 mm. broad, retuse, when very young densely 

 pubescent but soon glabrate. 



Type U. S. National Herbarium no. 571003, collected by C. Conzatti on Cerro San 

 Antonio, Oaxaca, Mexico, October 28, 1908 (no. 1587). 



I would place this species near P. pavoni Chodat, but it is not a very close relative. 



Polygala lozani Rose. 

 Polygala calticola Rose, Contr. Nat. Herb. 10: 122. 1906, not Chodat, 1893. 



Polygala minutifolia Rose, sp. nov. 



Stems much branched, diffuse, slender, nearly glabrous; leaves minute and scale- 

 like or wanting; inflorescence a few-flowered raceme; fruiting pedicels about 1 mm. 

 long, slightly pubescent; sepals eemipersistent, 2 mm. long, somewhat scarious; 

 petals pale; crown cristate; capsule orbicular or a little longer than broad, 3 mm. 

 long, Blightly hairy, especially near the top. 



Type U. S. National Herbarium no. 462685, collected by C. G. Pringle on dry 

 limestone cliffs of the Sierra Madre near Monterey, Mexico, July 10, 1907 (no. 13949). 



MALVACEAE. 



ERIOXYLUM, A NEW GENUS. 



Erioxylum Rose & Standley, gen. nov. 



Bractlets 3, minute, persistent, ovate, each bearing a large honey gland at base; 

 calyx small, subtruncate, with 5 minute teeth, within bearing a ring of hairs near 

 the base; petals large, purple; stamen tube elongated, anther-bearing except at the top, 

 here naked and cleft into linear lobes; style elongated, simple, bearing a clavate 

 stigma; capsule ovate to ovate-oblong, somewhat 3-sided, bearing black glands all 

 over its surface, the carpels 3; seeds ascending in the cells, glabrous on the face, 

 with a narrow ridge along the medial line, bearing dense cotton on the back and 

 sides; erect shrub or small tree with strict branches; leaves entire. 



This genus is nearest Gossypium and Ingenhouzia. From the former it differs in 

 its glandless leaves and minute involucral bracts and in its seeds. It is much closer 

 to Ingenhouzia but has still smaller bracts, glandless calyx, and entire leaves, and 

 is of very different habit. 



Two species are known, both from the west coast of Mexico. 



Type species, Erioxylum aridum Rose & Standley. 

 Erioxylum aridum Rose & Standley, sp. nov. 



Shrub or small tree, 3 to 6 meters high, with slender, upright branches; leaves 

 simple, entire, ovate, rounded or cuneate at base, acute, both surfaces slightly stel- 



