OP ARTS AND SCIENCES. 421 



Galphimia vestita. Densely villous-pubescent throughout : stems 

 numerous from a perennial caudex, a span high, branching above: leaves 

 narrowly lanceolate, acuminate, nearly sessile, glandular near the base, 

 1 to H inches long ; stipules free, linear: racemes short, the bracts 

 equalling the pedicels (2 or 3 lines long) : calyx-lobes 2}, lines long: 

 styles elongated, exserted ; ovary glabrous. — Same locality (187). 



Gaudichaudia Palmeri. Young stems appressed-silky : leaves 

 appressed-silky beneath, nearly glabrous above, oblong or the larger 

 oblong-ovate, abruptly acute, rounded at base, 1 or 2 inches long, on 

 very short petioles : normal Howers upon a short 3-flowered bibracteate 

 peduncle, the slender pedicels 4 to 6 lines long ; the 2 or 3 sterile fila- 

 ments nearly equalling the others, slender, the apex subulate ; abnor- 

 mal fertile flowers nearly sessile in the axils : samara with a lateral 

 wing nerved on the inner side, the dorsal and lower wings short and 

 narrow. — Same locality (132). 



Tribulus grandiflords, Benth. & Hook. — Same locality (108). 



Geranium Mexicanum, HBK. — Yerba Buena (30-5). 



Geranium Wislizeni. Resembling the last, but the leaves more 

 obtusely lobed, the pedicels soon divaricate and geniculate, and the 

 carpels beaked w^ith a longer style. — Norogachi, in clefts of rocks 

 (428) ; also collected by Dr. Wislizenus on the Llanos mountains, 

 Chihuahua, and referred by Dr. Engelmann (PI. Fendler, 27) to G. 

 Hernandezii^ and by myself (Proc. Amer. Acad. 17. 334) to G. Mexi- 

 canum. 



Geranium niveum. Perennial, the stems a foot high or more, ap- 

 pressed-strigose : leaves mostly radical, white with a closely appressed 

 silky pubescence, circular in outline, 5-7-divided, the divisions deeply 

 3-5-cleft into linear segments : pedicels elongated, divaricate, with 

 short spreading glandular pubescence : sepals silky-pubescent and 

 somewhat villous, 4 or 5 lines long: beaks of the carpels 8 or 9 lines 

 long, hispid; style cleft nearly to the base. — Norogachi, in moist 

 grassy openings (406). 



Erodium cicutarium, Linn. — Same locality (394). 



Ptelea angustifolia, Benth. A shrub, 8 or 10 feet high. — 

 Hacienda San Miguel (152). 



Bursera graveolens, Trian. & Planch. A " copal-varnish tree," 

 about 15 feet high and 18 inches in diameter, with a few stiff branches: 

 wood with large pith and exceedingly brittle : leaflets 3 to 6 pairs. — 

 Same locality (Y). 



Bursera bipinnata, Engler. A "copal-varnish tree," 10 feet 

 high and 2 to G inches in diameter, with short compact branches and 



