Blake Revision of Poly gala 19 



a. Plant densely and shortly pilose-hirsute with spreading 

 hairs, b. 



b. Capsule merely ciliate; wings shorter than keel 14. P. ovatifolia. 



b. Capsule puberulous on sides; wings longer than keel. . 15. P. buxifolia. 

 a. Hairs incurved or appressed, c. 



c. Wings subpersistent 16. P. myrtilloides. 



c. Wings quickly deciduous, d. 



d. Leaves oval or elliptic, obtuse or rounded, e. 



e. Flowers 3.8 mm. long 17. P. Robinsonii. 



e. Flowers 6-6.5 mm. long 18. P. Xanti. 



d. Leaves ovate, acuminate 19. P. serpens. 



14. P. ovatifolia Gray. Suffrutescent at base, branched, erect, 

 3 dm. or less high, the stem and branches, raceme-axes and pedicels 

 densely softly pilose with wide-spreading hairs. Leaves ovate (on 

 the branches sometimes ovate-oblong), acutish rarely obtuse, with 

 often obliquely bent apex, rounded or cuneate at base, with 2-3 

 pairs of lateral veins, not reticulate, rather densely short-pilose 

 both sides with spreading hairs, 1.2-3 cm. long, 0.6-1.3 cm. wide, 

 on shortly spreading-pilose petioles 2 mm. or less long. Racemes 

 rather loose, 2-6.5 cm. long. Flowers 7.5-8 mm. long. Sepals 

 ovate-lanceolate, acute, 3 mm. long, pilose like the 4-5 mm. long 

 oblong to oval abruptly short -pointed soon deciduous wings. Cap- 

 sule marginally ciliate, orbicular, 8.5-9 mm. long, 8.5-9 mm. wide. 

 Seed 4 mm. long. Aril medium, with rather broad lobed and tabu- 

 late scarous margin. Gray! PL Wright, i. 39 (1852); Chod. 

 Monog. ii. 19. t. 13. f . 26-30 (1893) ; Rob. in Gray, Syn. Fl. i. pt, 1. 

 450 (1897). P. ovatifolia Gray! PL Lindh. ii. (Journ. Bost. Soc. Nat. 

 Hist, vi.) 151 (1850), in text, not DC.; Wheelock, Mem. Torr. Club 

 ii. 148 (1891), by cler. err. Nuevo Leon: Monterey, Edwards 

 & Eaton (GK); Monterey, 1880, Palmer 65 (GK). Also in Texas 

 and New Mexico: Wright 71 (K), Jj03 (type coll.: BGK), 935 

 (BG); Mex. Bound. Survey under Emory 191 (K). T. 1. Fig. 6. 



15. P. buxifolia HBK. Similar in habit and pubescence. 

 Leaves elliptic or the upper ovate, obtuse, rounded, or retuse at 

 apex, the upper sometimes acutish, rounded to cuneate at base, 

 reticulate beneath, pubescent as in P. ovatifolia or sometimes with 

 more or less incurved hairs, the lower 1.3-1.9 cm. long, 7.5-12 mm. 

 wide. Flowers 5.5 mm. long. Wings obovate-oval, short-pilose, 

 rounded at apex, subpersistent, 5.5 mm. long. Keel 4-4.5 mm. 

 long. Capsule oval, slightly oblique at apex, densely pilosulous, 

 8 mm. long, 6.5 mm. wide. Aril with broader scarious margin and 

 distinct short barely lobulate lateral and spreading dorsal lobes. 



