206 FABACEAE. 



16. JONESIELLA Rydb. 



i. Jonesiella asclepiadoides (Jones) Rydb. (Astragalus asclepiadoides 

 Jones) In arid soil of Colo, and Utah. Southeast of Hotchkiss; Grand 

 Junction. 



17. PHACOPSIS Rydb. 



Plant perfectly glabrous ; leaflets oval, retuse or obtuse. i . P. praelongus. 



Plant hispidulous-strigose on the upper part of the stem and the lower surface of 



the leaves. 2. P. Pattersonii. 



1. Phacopsis praelongus (Sheldon) Rydb. (A. procerus A. Gray) From 

 Colo, to N. M. and Ariz. Alt. 2500-6500 ft. Arboles; Cimarron. 



2. Phacopsis Pattersonii (A. Gray) Rydb. (A. Pattersonii A. Gray) On 

 plains and open ground in Colo, and Utah. Alt. up to 7000 ft. Mancos; 

 Wolcott, Eagle Co.; Grand River Canon; Hotchkiss; Grand Junction; 

 Ridgeway. 



18. XYLOPHACOS Rydb. 



Pod short-hairy or glabrous. 



Plant villous ; both of the sutures inflexed. i . X. Parryi. 



Plant cinereous ; none of the sutures or only the dorsal one inflexed. 

 Pod at first somewhat fleshy, in age spongy ; plant acaulescent. 



2. X. pygmaeus. 

 Pod coriaceous. 



Pods straight or nearly so. 



Pods when mature somewhat compressed laterally. 3. X. missouriensis. 

 Pods when mature compressed vertically. 4. X. vespertinus. 



Pods more or less curved. 



Pods obtuse at the base ; dorsal suture strongly inflexed ; leaves white- 

 silky on both sides. 5. X. Shortianus. 

 Pods tapering at both ends. 



Pod over 3 cm. long; upper suture strongly arched; calyx-teeth short, 



triangular. 6. X. amphioxus. 



Pod less than 3 cm. long; upper suture straight or slightly curved; 



calyx-teeth linear-subulate. 7. X. uintensis. 



Pod long-hairy, densely villous ; corolla yellow or keel purple. 



Leaflets broadly obovate, appressed-silky. 8. X. Newberryi. 



Leaflets elliptic or oblanceolate, long-villous. 9. X. Purshii. 



1. Xylophacos Parryi (A. Gray) Rydb. (Astragalus Parryi A. Gray) 

 On mountain ridges of Wyo. and Colo. Alt. 5000-10,000 ft. Near Empire; 

 Turkey Creek and tributaries; Ft. Collins; Wahatoya Canon; headwaters 

 of Sangre de Cristo Creek; headwaters of Pass Creek; Estes Park; Bijou 

 Basin; Platte Canon; Rist Canon; Chambers' Lake; vicinity of Como; near 

 Boulder. 



2. Xylophacos pygmaeus (Nutt) Rydb. (Phaca pygmaea Nutt; A. 

 chamaeluce A. Gray; A. Cicadae Jones) Dry hills and arid plains of Colo., 

 Wyo. and Utah. Grand Junction. 



3. Xylophacos missouriensis (Nutt.) Rydb. (A. Missouriensis Nutt.) 

 On plains from Sask. and Mont, to Kans. and N. M. Alt. 4000-10,000 ft. 

 Ft. Collins; New Windsor, Weld Co.; Arboles; Walsenburg; river bluffs 

 north of La Veta ; mesas near Pueblo ; Turkey Creek and tributaries ; Grand 

 Junction. 



