462 PROCEEDINGS OP THE AMERICAN ACADEMY. 



tended by two leaf-like bracts, the lateral branches or peduncles not pro- 

 liferous, reflexed in fruit. — Torr. & Gray, Fl. ii. 20 ; Gray, PI. Lindh. ii. 

 215, & Syn. Fl. N. A. i. pt. 2, 36. G. Texanum, Scheele, Linneea, xxi. 

 597. — Louisiana, Hale; Texas, Lindheimer, uos. 246, 491, Drummond, 

 no. Ill, Wright (without number), at Belknap, Sutton Hayes, v\o. Z21 

 in part, Dallas, May, 1875, Reverchon, Heller, no. 1437 (distributed as 

 G. Texense, A. Gray) ; Missouri, Allenton, 15 June, 1880, Geo. W. 

 Letter man ; Tennessee, cedar barrens at La Vergne, 16 JNIay, 1882, 

 Gattinger. 



Var. leiocarpuji, Torr. & Gray. Stem and leaves nearly glabrous : 

 fruit smooth and glabrous. — Torr. & Gray, Fl. ii. 20; Gray, Syn. Y\. 

 N. A. i. pt. 2, 36. — Texas, Drummond, no. 113, E. Hall, no. 273, 

 Wright (without number), also a specimen of Nuttall's coUection-'bearing 

 the datum " Red River." 



§ 2. Fruit hirsute with long and straight (not uncinate-tipped) bristles. 



* Leaves linear or linear-oblong (in G. Wrightii, var. hdifoUum, often somewhat 

 elliptic or oblong-oblanceolate), 1-nerved. 

 ■t- Flowers axillary, solitary or in pairs, subsessile. 



12. Cr. oresbmm. Perennial: stems from a woody base, some- 

 what cespitose, 1 to 2 dm. high, below often naked and glabrate, numer- 

 ously branched, leafy and pilose-hirsute above : leaves in fours, linear or 

 linear-oblong, 2 to 4 mm. long, 1 mm. or less in breadth, acutish, hirsute- 

 pubesceut, margin revolute, midrib much thickened and prominent be- 

 neath, bearing on the under surface near the apex a single large gland : 

 corolla about 2.5 mm. in diameter, 4-parted; lobes oblong-ovate, obtuse, 

 externally pubescent. — Collected by C. G. Pringle, on dry mountain 

 walls, Sierra de la Silla, Nuevo Leon, 16 July, 1889, no. 2542. 



•1- -1- Inflorescence eymose-paniculate : flowers distinctly pedicellate. 

 ++ Dioecious : flowers yellowisli. 



G. Fendleri, Gray. Stems several, erect or ascending, 1.5 to 3 dm. 

 high, rising from a perennial base, glabrous or minutely and closely 

 puberulent: leaves linear or linear-oblong, 0.5 to 1.5 cm. long, 1 to 3 

 mm. broad, acute or obtuse, glabrous or finely puberulent : flowers 

 small : ovary bearing inconspicuous closely ajipressed hairs, these later 

 spreading and becoming more prominent. — PI. Fendl. 60, & Syn. Fl. N. A. 

 i. pt. 2, 41. G. Rothrockii, Gray, Proc. Am. Acad. xvii. 203, in part 

 (as to Rusby's plant). — New Mexico, Fendler, no. 288, White Mts., 

 altitude 2300 m., Wooton, no. 287 ; Arizona, Mogollon Mts., Rushy, 

 no. 155, Santa Rita Mts., 10 July, 1881, and 25 July, 1884, Pringle, 

 Mt. Graham, Rothrock, no. 416, near Fort Huachuca, Lemmon, no; 2903. 



