﻿North American Polygonaceae. 43 



*/ Eriogonum croceum. 



Perennial, shrubby below, tomentose. Stems spreading, 1-3 

 dm. long; branches often tufted : leaves clustered at the ends of 

 the shoots; blades oval or orbicular-oval, I— 1.5 cm. long, obtuse, 

 tomentose or glabrate above, abruptly narrowed at the base ; pet- 

 ioles variable, some shorter than the blades, some longer : scapes 

 erect, 1-2 dm. tail, simple, usually naked, except the whorl of 

 leaf-like bracts]subtending the compound umbel and one bract near 

 the middle of the scape : involucres terminal, thinly tomentose ; 

 tubes broadly turbinate, 2-2.5 mm. long, finely ribbed ; segments 

 longer than the tube, unequal, usually broadest above the middle, 

 acute: calices glabrous, golden yellow 5-6 mm. long, narrowed 

 into a long stipe-like base; segments unequal, the 3 outer oblong, 

 the 3 inner cuneate-spatulate, all obtuse: filaments villous below 

 the middle : achenes 3-angled, 4 mm. long, sparingly villous at 

 the apex. 



A beautiful species hitherto confounded with Eriogonum tun- 



bcllatum. It is easily distinguished by habit, and the peculiar 



compound umbel is at once diagnostic. The scape often bears 



one leaf-like tract near the middle and commonly produces a 



branch several centimeters below the base of the umbel, i note 



the following specimens: Idaho Plants, no. 3414, Heller ; Burne.% 



Grant County, Oregon, September 28, 1896, Brown; Redfish 



Lake, Idaho, no. 420, Evermann. Ranges from 1,100 to 2,000 



meters in altitude. 



Eriogonum trichotomum. 



Perennial, rather slender, densely tomentose. Stems woody, 

 branching; branches spreading, 1-2 dm. long: leaves chiefly 

 confined to the ends of the branches, elliptic, oval or spatulate, 

 8-1 5 mm. long, obtuse, slightly revolute, somewhat less densely to- 

 mentose above than beneath; petioles much shorter than the blades : 

 scapes erect or ascending, 1-2 dm. tall, topped by a simple 3-rayed 

 umbel, 2 rays with a whorl of bracts at the middle, 1 naked, all 

 much shorter than the rest of the scape : involucres terminal ; 

 tubes broadly campanulate, about 2 mm. high, ribbed ; segments 

 oblong, recurved, longer than the tube : calices yellow, glabrous, 

 5-6 mm. long ; segments spatulate, rounded or slightly retuse at 

 the apex, the 3 inner somewhat narrower than the 3 outer : fila- 

 ments villous below the middle: achenes 3 angled, 4 mm. long, 

 villous below the apex. 



Mt 



Summer. 



One of the rare California!! species at one time referred to 



