ROBINSON. — SYNOPSIS OF THE GENUS NOCCA. 471 



finely villous, 6 to 7 mm. long : corolla 7 mm. long, puberulent, the teeth 

 ovate. — Pochutla, Oaxaca, Liebmann, no. 250 (type in herb. Bot. Gard. 

 Copenhagen ; fragment and good sketch in herb. Gray). 



b. Stem and floral branches glabrous. 



13. N. Palmeri. Slender-stemmed shrub, with terete divaricate gla- 

 brous branches ; interuodes long, in dried state finely ribbed : leaves 

 ovate, acute, scabrous both above and beneath with enlarged and indur- 

 ated bases of trichomes (in the manner of many Borraginaceae), nearly 

 or quite entire, 1.5 to 2.5 cm. long, abruptly narrowed at the base to 

 a very short petiole : floral branches opposite ; peduncles slender, 2 to 

 4 cm. long ; glomerules 2.5 cm. in diameter, subglobose, about 25-headed; 

 subtending bracts ovate-oblong to narrowly oblong, 6 to 8 mm. in 

 length, their pubescence similar to that of the leaves ; involucres terete, 

 10-nerved, 1 cm. long, sparingly villous; segments deltoid-lanceolate, 

 minutely ciliated: corolla 1 cm. long, essentially glabrous; its teeth ellip- 

 tic-oblong, 3 mm. in length, 2-nerved: pappus a finely fringed campanulate 

 cup. — Collected by Dr. Edward Palmer, at Colima, Mexico, 27 to 28 

 February, 1891, no. 1320. 



-i- ■»- Annual: tropics of both hemispheres. 



14. N. mollts, Jacq. Frag. 58, t. 85 (1809). Lagasca mollis, Cav. 

 Ann. Cien. Nat. vi. 333, t. 44 (1803). JSToccaea mollis, Cass. 1. c. 103 

 (1822). Lagascea Kunthiana campestris, Gard. in Hook. Lond. Journ. 

 Bot. v. 238 (1846). Lagasca parvifolia, Klatt, Ann. k. k. Nat. Tlofmus. 

 Wien, ix. 360 (1894). — Western and southern Mexico, tropical South 

 America, West Indies, also Bengal, etc. 



III. — NEW SPECIES AND NEWLY NOTED SYNONYMY 

 AMONG THE SPERMATOPHYTES OF MEXICO AND 

 CENTRAL AMERICA. 



Dioscorea platycolpota, E. B. Uline in litt. " Glabrous throughout; 

 stem stout, dextrorsely twisted ; leaves membranaceous, orbicular-cordate, 

 9 to 11-nerved; $ racemes short, solitary, densely flower-bearing nearly 

 to the base; flowers pedicellate, disposed in 3 to 5-flowered cymules, 

 which in turn are closely arranged on the pend;mt rachis ; perianth 

 greenish yellow, campanulate, equalling or surpassing the slender pedicel; 

 stamens three, rising divaricately from the somewhat fleshy receptacle, 

 a little shorter than the ovate segments of the perianth ; anthers extrorse. 

 Pistillate spikes short, solitary ; perianth very shortly stipitate ; style 



