Blake Revision of Polygala 23 



l. Middle leaves obovate-oblong, 4.5-7 mm. wide. .28. P. Palmeri. 

 I. Middle leaves linear or linear-lanceolate, 1-3 mm. 

 wide, m. 

 m. Upper leaves more or less reduced, 4.5-10 (22) 

 mm. long, n. 

 n. Aril with more or less distinct dorsal lobe, 

 raised on the constricted apex of the seed 



24. P. Barbeyana. 

 n. Aril without distinct dorsal lobe, subsessile, o. 



o. Umbo densely pilose 27. P. intricata. 



o. Umbo nearly glabrous 26. P. zacatecana. 



m. Upper leaves not reduced, 1.5-3.1 cm. long. . . .29. P. racemosa. 

 j. Aril larger, the depth of its more or less lobed or lobu- 

 late scarious margin equalling or exceeding the 

 height of the umbo, p. 

 p. Aril with 3 slender appressed lobes about | as long as 



seed 38.1. P. tenuiloba. 



p. Aril not divided into 3 slender lobes, q. 



q. Aril veil-like, with broad scarious lobulate margin 

 covering the upper f-f of seed, the dorsal 

 margin vertically descending, the lower mar- 

 gin nearly or quite horizontal, r. 



r. Sepals and wings quickly deciduous 32. P. obscura. 



r. Wings and upper sepal rather persistent 34. P. Lozani. 



q. Aril otherwise, s. 



s. Upper leaves ovate to elliptic-oblong, t. 



t. Wings 6-6.5 mm. long 36. P. oophylla. 



t. Wings 4-5 mm. long, u. 



u. Scarious border of aril distinctly deeper 

 than height of umbo; keel yellowish- 

 green 37. P. Brandegeeana. 



u. Scarious border of aril barely as deep as 



height of umbo ; keel purplish . .35. P. brachyanthema. 

 s. Upper leaves linear to oblong-lanceolate, v. 



v. Upper leaves reduced, 5-14 (23) mm. long. . .25. P. reducta. 

 v. Upper leaves not reduced, 1.7-3.6 cm. long. . . .30. P. longa. 

 (P. Conzattii Rose (no. 21) and P. oaxacana Chod. (no. 33) have not been 

 inserted in the key owing to lack of information.) 



20. P. Pavoni Chod. Undershrub, the stems puberulous, as- 

 cending, divaricately branched, 1-2 dm. long. Leaves elliptic or 

 elliptic-ovate, obtuse, " irregularia et diversa," puberulous, 20 mm. 

 long, 12 mm. wide. Racemes few-flowered. Flowers 5-6 mm. long. 

 Sepals lance-linear, acute, pubescent. Wings elliptic, subsessile, 

 obtuse, glabrous, reticulate-veined. Upper petals dilated at apex, 

 subacute, scarcely shorter than keel. Staminal tube and free por- 

 tions of filaments long-pilose. Ovary elliptic, ciliate. Capsule and 

 seed unknown. Chod. Monog. ii. 14 (1893). 



Not seen; description compiled. Based by Chodat on a Pavon 

 specimen (hb. Boiss.) said to have been collected in Mexico. A 

 specimen of Pavon' s in the British Museum, so labelled by Chodat, 

 has obviously nothing to do with this species as originally described. 



