400 



NORTH AMERICAN FLORA 



[Volume 24 



Pod lanceolate-ovoid, strongly arcuate; calyx sparingly black- 

 hairy. 

 Pod ovoid, only the tip upturned ; calyx white-hairy. 



Leaflets pubescent on the lower side; calyx-teeth less than one third 

 as long as the tube; pod mottled, lanceolate-ovoid, strongly 

 arcuate. 

 Pod papery, less than 2.5 cm. long, rarely more than 2 cm. long; corolla 

 less than 1 cm. long. 

 Leaves glabrous or nearly so; corolla pure-white. 

 Pod mottled, round-ellipsoid, merely mucronate. 

 Pod not mottled, with a distinct beak. 



Pod short-acuminate, with a laterally flattened upturned 

 apex; raceme rather lax on peduncles longer than the 

 internodes of the stem. 

 Pod long-acuminate, the apex scarcely flattened. 



Racemes very dense, on stout peduncles, usually shorter 



than the internodes. 

 Racemes and peduncles elongate, the latter longer than 

 the internodes. 

 Leaves canescent with loose kinky hairs; corolla tinged with pink; 

 plant 1-2 dm. high. 

 Pod pubescent. 



Pod 1.5-3 dm. long, acute or acuminate. 



Leaflets glabrous or with a few scattered hairs on the margins and 

 ribs beneath. 

 Pod about 3 cm. long, leathery; corolla about 15 mm. long 



calyx with scattered black hairs. 

 Pod about 2 cm. long; corolla about 10 mm. long. 



Pod strongly incurved -arcuate, comparatively firm; calyx 



often more or less black-hairy. 

 Pod ovoid, not strongly arcuate, papery; calyx white-hairy. 

 Pod straw-colored, unspotted; calyx-teeth lance-subulate; 



leaflets oblong or oblanceolate. 

 Pod mottled; calyx-teeth deltoid; leaflets obovate. 

 Leaflets pubescent on both sides. 

 Pubescence spreading. 

 Pubescence appressed. 

 Pod 6-7 mm. long, subglobose, sulcate on both sutures, round-ellipsoid 

 to lance-ovoid, more than 1.5 cm. long. 



4. Dipftvsa 



Pod round-ellipdoid to lance-ovoid, more than 1 .5 cm. long. 

 Stem prostrate; leaflets oblong; pod pubescent, mottled. 



Stem elongate, about 15 dm. long; calyx-lobes at least half as long 



as the tube. 

 Stem 2-3 dm. long; calyx-lobes less than one fourth as long as the 

 calyx-tube. 

 Stem erect or ascending; leaflets obovate. 

 Pod ovoid with a distinct beak. 



Pod pubescent; calyx black-hairy, the teeth deltoid, less than 



one fourth as long as the tube. 

 Pod usually glabrous; calyx white-hairy. 



Pod not mottled; calyx-teeth about one third as long as the 



tube; plant 3-4 dm. high. 

 Pod mottled; calyx-teeth less than one fourth as long as the 

 tube; plant less than 2 dm. high. 

 Pod rounded-ellipsoid, spotted, mucronate; stem 1-2 dm. high; 

 calyx with scattered black hairs, the teeth subulate, half as iong 

 as the tube. 

 Pod subglobose. about 1 cm. long, deeply sulcate on both sutures, glabrous. 



14. C. platyphyllidium. 

 30. C. diphysum 

 (v. albiflorum). 



15. C. araneosum. 

 32. C. latum. 



16. C. salinum. 



17. C. floribundum 



18. C. scorpionis. 



19. C. griseohtm. 



20. C. cornulum. 



21. C. lentiginositm. 



22. C. ormsbyense. 



23. C. Sierrae. 



24. C. ineptum. 



25. C. albifolium . 



26. C. kernense. 



27. C. scsquimelrale. 



28. C. idriense. 



29. C. lehatchapiense. 



30. C. diphysum. 



31. C. pardalotum 



32. C. latum. 



33. C. MacDougali. 



1. 



Cystium platytrope (A. Gray) Rydb. Bull. Torrey Club 

 40: 50. 1913. 



Astragalus platytropis A. Gray, Proc. Am. Acad. 6: 526. 1865. 



Tragacantha platytropis Kuntze, Rev. Gen. 947. 1891. 



Phaca platytropis Rydb. Mem. N. Y. Bot. Gard. 1: 246. 1900. 



A cespitose perennial, with a branched woody rootstock; stems very short, less than 1 dm. 

 high, decumbent, leafy; leaves 2-8 cm. long, spreading; stipules ovate, acuminate, membranous; 

 leaflets 7-13, obovate or oval, acute to retuse, silvery-silky; peduncles scapiform, 3-8 cm. long; 

 flowers in headlike racemes, few; calyx silky, the tube campanulate, about 2 mm. long, the 

 teeth subulate, nearly as long; corolla dirty- white, with purple-tipped keel, 7-8 mm. long; 

 banner rounded-obovate, emarginate, only slightly longer than the wings and keel; wings 



