664 RypBERG: ASTRAGALUS AND ITS SEGREGATES 
Cnemidophacos flavus (Nutt.) Rydb. 
Astragalus flavus Nutt. in T. & G. Fl. N. Am. 1: 335. 1838. 
Tragacantha flavifora Kuntze, Rev. Gen. Pl. 2: 941. 1891. 
Astragalus flaviflorus Sheld. Bull. Geol. & Nat. Hist. Surv. Minn. 
9: 158. 1894. 
This has been placed in the Zu-Astragalus division, next after 
A. racemosus, and in a section together with A. huministratus and 
A. oreganus, to which it has no relationship. The only similarity 
is the conspicuousness of the stipules. 
13. Diholcos Rydb. gen. nov. 
Stout erect perennials often forming clumps. Leaves pinnate 
with many thick leaflets ; stipules lanceolate, free. Raceme many- 
flowered, dense, spike-like ; bracts lance-subulate. Calyx campanu- 
late, gibbous at the base on the upper side; teeth subulate- 
setaceous. Corolla purple, white or ochroleucous ; petals only 
moderately curved and blunt. Pod coriaceous, stipitate, oblong, 
straight, rounded on the lower suture, deeply 2-grooved above 
and with a prominent upper suture, 1-celled. 
The first species is to be regarded as the type. 
Diholcos bisulcatus (Hook.) Rydb. 
Phaca bisulcata Hook. Fl. Bor. Am. 1: 145. 1831. 
Astragalus bisuleatus A. Gray, Pac. R. R. Rep. 12: 42. 1860. 
Diholcos decalvans (Gandoger) Rydb. 
Astragalus bisulcatus decalvans Gandoger, Bull. Soc. Bot. France 
48: xv. 1002. 
Diholcos Haydenianus (A. Gray) Rydb. 
Astragalus Haydenianus A, Gray in Brandegee, Bull. U. S. Geol. 
Surv. Lerr. 2: 235," 1876, 
4c FRAGA 1. Sp. PL yee, tees. 
The Colorado species are as follows : Phaca longifolia (Pursh) 
Nutt., P. picta A. Gray, P. Candolleana H. B. K., P. pauciflora 
Nutt., and: 
Phaca Eastwoodiae (Jones) Rydb. 
Astragalus Preusstt sulcatus Jones, Zoe 4: 37. 1893. 
Astragalus Eastwoodiae Jones, Zoe 4: 368. 1894. 
Phaca artipes (A. Gray) Rydb. 
Astragalus artipes A. Gray, Proc. Am. Acad. 13: 370. 1878. 
