478 PROCEEDINGS OP THE AMERICAN ACADEMY. 



hitherto definitely known to occur in Mexico, has been collected by 

 Mr. Nelson on Maria Magdalena Island of the Tres Marias group of 

 islands, 26-28 May, 1897, no. 4327. 



Thelypodium longifolium, Watson, Proc. Am. Acad. xvii. 321. 

 To this species may be referred Pringle's no. 6o-18, from the Valley of 

 Mexico, 30 September, 1896, distributed under T. micranthum^ Watson, 

 and later described by Professor Edward L. Greene, Pittouia, iii. 247, as 

 T. anisopetalmn. 



Erysimum macradenium. Gay, Erys. Nov. 8. Excellent specimens 

 of this interesting species, both in flower and fruit, were collected by C. 

 Conzatti and V. Gonzalez on the summit of the Sierra de San Felipe, 

 Oaxaca, 15 August and 26 September, 1897, no. 499. The species is 

 well marked by the large placental glands, and by the long capsules (15 

 to 16 cm, in length). 



Phyllanthus subcuneatus. Suffruticose, about 1 m. high, 

 glabrous throughout: stems and branches covered with a grayish bark, 

 the younger shoots reddish: leaves alternate, often subfascicled, petiolate, 

 obovate, obovate-cuneate or distinctly cuneate, 3 to 10 mm. long, two 

 thirds as broad, rounded, subtruncate or retuse at the apex, entire, some- 

 what paler beneath ; petioles 1 to 1.5 mm. long; stipules minute, about 

 1 mm. in length : flowers axillary : staminate flowers about 3 mm. broad, 

 short-pedicellate ; pedicels 1 to 4 mm. long : calyx 6-parted ; divisions 

 oblong or oblong-ovate, rounded at the apex, 1-nerved, margins scarious : 

 stamens monadelphous ; anthers 3 at the top of the column ; glands 6, 

 distinct : pistillate flowers 3 to 4 mm. broad, on slender pedicels, 6 to 9 

 mm. long : calyx 6-parted ; the divisions obovate, rounded or obtusish at 

 the apex, green ; the disk cupulate, 6-lobed : ovary glabrous ; styles 

 united at the base only, spreading; stigmas slightly 2-lobed : capsule 

 about 3 mm. in diameter, slightly broader than long : seeds triangular, 

 about 2 mm. long, with a reddish brown minutely roughened surface. — 

 Collected by C. G. Priiigle on limestone ledges near Tehuacan, altitude 

 1540 m., 29 July, 1897, no. 6753. 



Argithamnia neo-mexicana, Miill. Arg., var. depressa. Stems 

 immei'ous, prostrate from a woody perennial base : leaves oblanceolate, 

 2.5 to 4 cm. long, about 8 mm. broad, narrowed below into a subpetiolate 

 base, glabrate : calyx-divisions of the fertile flowers a little shorter and 

 somewhat less acuminate than in the type : seeds conforming to tlie 

 species proper. — Collected by C. G. Pringle on calcareous plains of 

 Tehuacan, altitude 1540 m., 29 July, 1897, no. 6752. 



Euphorbia laceba, Boiss. Euph. Cent. 22, & Euph. Ic. t. 30. A 



