460 PROCEEDINGS OF THE AMERICAN ACADEMY, 
2 to 3.5 mm. broad, submucronate, narrowed into a subpetiolate base, 
glabrous or somewhat hirtellous on the upper surface and on the mar- 
gin, rather densely elongate-punctate: flowers terminating the lateral 
branches usually in 3-flowered cymes. — Collected about Orizaba by 
Miiller in 1885, no. 1523. 
+ + + Flowers terminating the stems and branches in small close cymes: 
uncinate bristles of the fruit spreading. 
++ Essentially glabrous: flowers usually white or greenish white. 
G. Seatonii. Perennial: stems prostrate or ascending, much 
branched, glabrous: leaves sessile, broadly oblong to oblong-lanceolate, 
3 to 10 mm. long, 1.5 to 5 mm. broad, submucronate or short-acuminate, 
glabrous or slightly hirtellous on the upper surface: corolla about 3 mm. 
broad, 4-lobed; lobes oblong-ovate, acute: pedicels later becoming some- 
what elongated, 3 to 8 mm. in length: fruit 1.5 mm. in breadth. —Mt 
Orizaba, altitude 3075 m., 5 August, 1891, Henry E. Seaton, no. 174, 
distributed as G. uropetalum, Hemsl.; Federal District, Serrania de 
Ajusco, altitude 3075 m., 6 September, 1896,. Pringle, no. 6461, dis- 
tributed as G. Jalapense, Schlecht. 
++ ++ Hirsute-pubescent: flowers purplish. 
9. G. Nelsonii. Perennial: stems ascending, 1 to 2 dm. in length, 
more or less branched, hirsute-pubescent upon the angles and also at the 
nodes: leaves sessile, ovate or slightly oblong-ovate, acute, usually 
hirsute-pubescent above and on the midrib bencath, margin ciliate: 
flowers, bracts, and upper leaves purplish: corolla about 3 mm. in diame- 
ter, 4-parted; lobes oblong-ovate, obtusish. — Summit of Mt. Zempoalte- 
pec, Oaxaca, altitude 3480 m., 9 July, 1894, Z. W. Nelson, no. 628. 
* * * * Leaves in fours: inflorescence chiefly axillary. 
+ Flowers on slender pedicels. 
G. Texense, Gray. Annual, branching from the base: stems more 
or less erect, 1 to 3 or 4 dm. high, hirsute-pubescent: leaves ovate or 
oblong-ovate, 0.5 to 1.5 em. long, one half to two thirds as broad, hirsute- 
pubescent upon either surface: peduncles axillary, slender, about equal- 
ling the leaves, occasionally proliferous: fruit 2 mm. in diameter. — 
Proc. Am. Acad. xix. 80, & Syn. Fl. N. A. i. pt. 2,86. G. Californi- 
cum, var. Texanum, Torr. & Gray, Fl. ii. 20. G. uncinulatum, Gray, 
Pl. Lindh. ii. 215? not DC.— Texas, Drummond, no. 115, Lindheime’; 
no. 619, Wright (without number), on rocky hills near Austin, E. Hall, 
no, 274, along Brazos River, Palo Pinto Co., Reverchon. No specimens 
from Mexico, belonging to this species, have been seen by the writer, yet 
__ it is altogether probable that the species occurs south of the Rio Grande. 
