FLOWERING PLANTS AND FERNS OF ARIZONA 521 



1. Keel-petal crested or beaked (9). 



9. Crest of the keel none, the keel ending in a conic or c\~lindric, entire beak, 



this almost obsolete in P. acanthoclada (10). 



10. Branches not or only slightly spinescent; stems less than 20 cm. long (11). 



11. Herbage pilose; stems few, relatively stout ; leaf blades 3 to 8 mm. wide; 



wing petals 8 to 10 mm. long, rose purple, the keel with a very stout 



and blunt yellow beak 9. P. rusb yi. 



11. Herbage puberulent; stems numerous, slender; leaf blades commonly 



not more than 3 mm. wide; wing petals 4 to 5 mm. long, the keel 



with a relatively slender beak 10. P. tweed yi. 



10. Branches pronouncedly spinescent (12). 



12. Plant suffrutescent; stems not more than 15 cm. long; herbage puberu- 



lent or glabrate; leaf blades 3 to 6 mm. wide; wing petals 8 to 12 mm. 

 long, purplish pink, the keel conspicuously beaked; capsules more 



than 5 mm. long 11. P. subspixosa. 



12. Plant shrubby, intricately branched; stems up to 90 cm. long; herbage 

 short-pilose; leaf blades seldom more than 3 mm. wide; wing petals 

 not more than 5 mm. long, yellowish, sometimes tipped with purple, 

 the keel inconspicuously or obscurely beaked; capsules 4 to 5 mm. 



long 12. P. ACANTHOCLADA. 



9. Crest of the keel conspicuous, fimbriate; leaves (except the lowest) linear or 



linear-lanceolate (13). 



13. Plant annual; stems not rushlike, freely branched above the base, very 



slender, rarely more than 30 cm. long; flowers in loose racemes, not 



more than 2.5 mm. long, rose purple to nearly white; capsules not 



winged; lower leaves in whorls of 4 or 5 13. P. glochidiata. 



13. Plants perennial; stems rushlike, not or sparingly branched above the 



base, angled, sulcate, often more than 30 cm. long; flowers in spikelike 



racemes (these rather dense at first), more than 2.5 mm. long, whitish, 



the petals often with greenish or purplish veins (14). 



14. Capsules not winged, at most narrowly margined on both cells; leaves 



(at least the lowest) often in whorls; plant often with short, very 



leafy basal shoots 14. P. alba. 



14. Capsules with a scarious wing on the upper cell only; leaves all alter- 

 nate, scattered (15). 

 15. Stems glabrous or very nearly so; wing of the capsule broad. 



15. P. HEMIPTEROCARPA. 



15. Stems puberulent; wing of the capsule narrow. 16. P. scoparioides. 



1. Polygala macradenia A. Gray, PI. Wright, 1: 39. 1852. 



Gila, Maricopa, Cochise, Santa Cruz, and Pima Counties, 1,500 to 

 4,000 feet, dry rocky slopes, April to July. Western Texas to southern 

 Arizona and northern Mexico. 



2. Polygala piliophora Blake, North Amer. Fl. 25: 320. 1924. 

 Known only from the type collection in the Huachuca Mountains, 



Cochise County (Wilcox in 1894), August. 



3. Polygala barbeyana Chodat, Soc. Phvs. Hist, Nat. Geneve Mem. 



31 2 : 16. 1893. 

 Specimens from Beaver Creek, Yavapai County (Rusby 527, Purpus 

 8290), were identified by S. F. Blake as P. barbeyana, a species known 

 otherwise only from northern Mexico. In the writers' opinion, these 

 Arizona specimens more nearly resemble P. racemosa Blake, although 

 somewhat small-fruited for that species. 



4. Polygala racemosa Blake, Gray Herbarium Contrib. 47: 28. 1916. 

 Near Bisbee and near Benson, Cochise County {Mearns 1014, part, 



Carlson in 1915, Harrison and Kearney 5816), about 5,000 feet, May 

 and June. Southeastern Arizona and northern Mexico. 



