Blake Revision of Polygala 57 



0.3-0.5 mm. lata. Caules minus pubescentes. P. glanduloso- 

 pilosum Chod.! Bot. Jahrb. Hi. Beibl. 115. 72 (1914). 'San Luis 

 Potosi: Buena Vista, Nov. 1910, Purpus4913 (type coll.: BG); 

 Sierra de Guascama, Minas de San Rafael, May 1911, Purpus 

 5167 (BG). 



This does not seem specifically distinct from P. macradenia. 

 There are no flowers on the specimen of Purpus 4913 in the Gray 

 Herbarium, but those of 5167, which comes from the same region 

 and is considered identical with 4913 by Mr. Brandegee, are 5.3 

 mm. long and thus no smaller than those of P. macradenia. Nor do 

 I find a difference in the stigmas of the two. Since furthermore 

 various specimens that must be referred to P. macradenia show an 

 approach to P. glanduloso-pilosum in leaf-form or pubescence, the 

 latter seems best considered as a southern variety of the typical 

 more northern P. macradenia. 



Sect. 2. Biloba, sect. nov. Arillus glaber equitans lobis laterali- 

 bus 1/4 ad 1/2 longitudinis seminis, dorsali obsolete Sepala in- 

 feriora petaloidea decidua, superius herbaceum persistens. Species 

 typica P. Parryi A. W. Bennett. 



a. Stems densely canescent-pilose ; lower sepals glabrous; 



flowers purple 71. P. Purpasii. 



a. Stems finely incurved-puberulous ; lower sepals ciliate; 



flowers greenish 72. P. Parryi. 



71. P. Purpusii Brandegee. Fruticulose, the stems several, 

 simply or subsimply branched, erect, up to 2.5 dm. high, densely 

 pilosulous with incurved-spreading hairs, the younger parts canes- 

 cent. Leaves oval to oblong-oval, rarely orbicular, acute to obtuse 

 or rounded at both ends, more or less densely incurved-spreading- 

 pubescent both sides, 9-14 mm. long, 4-11 mm. wide, on petioles 

 1-2 mm. long. Racemes terminal, sessile or short-peduncled, up 

 to 4.5 cm. long, loosely 10-13-flowered. Flowers purplish, 4-4.5 

 mm. long, exceeding their pedicels, these equalling the narrowly 

 lanceolate bracts. Lower sepals petaloid, purplish, obliquely ob- 

 long-obovate, not clawed, 3.5 mm. long, 1.4 mm. wide; upper sepal 

 herbaceous, ovate, subglabrous, obtusish, 3 mm. long. Keel 

 whitish with yellowish tip, 3 mm. long. Wings obovate-oval, 

 barely retuse, 4.7 mm. long, 2.8 mm. wide. Upper petals purplish- 

 red, white toward end, united to keel about one-half their length, 

 obovate, 4.5 mm. long. Stigmatic lobes approximate at the flaring 



