56 ROBINSON. 



beneath; petiole 1-4 mm. long; heads in terminal corymbs, 10-12- 

 flowered, about 1 cm. high; involucre narrowly campanulate; scales 

 about 20, dusky-stramineous, scarious, obtuse, slightly lacerate-ciliate 

 toward the tip, the outer gradually shorter, about 5-nerved; corollas 

 gradually enlarged toward the summit, scarcely 5 mm. long, glabrous, 

 pale-blue or pale-purple; achenes dark, hispidulous on the angles and 

 slightly so on the upper part of the faces; pappus-bristles 30-35, yellow- 

 ish-white.— Hieron. in Engl. Bot. Jahrb. xl. 370 (1908).— Cuzco: on 

 the hill Sacsahuaman, near Cuzco, alt. 3500-3600 m., Weherhaucr, no. 

 4850; Ollantaytambo, alt. about 3000 m., Cook & Gilbert, nos. 369 

 (U. S.) and 589 (U. S.). 



This species in habit and many essential characters is exceedingly 

 close to E. salicinum Lam., of which it may ultimately prove a variety. 

 However, the leaves are less thick and not so firm nor so deeply wrinkled ; 

 their margins are less strongly revolute, and the upper surface perma- 

 nently hirtellous — the hairs (not readily visible except with a lens) 

 being white, subappressed, and slightly tuberculate-thickened at the 

 base. In E. salicinum, on the other hand, the leaves, even when young, 

 are quite glabrous on the upper surface, which is strongly bullate-rugose 

 and somewhat lucid. Furthermore, the achenes (at least in the form 

 occurring in Colombia) are sparsely covered with short-stiped capitate 

 glands. The flower-color in E. Volkensii was noted by Dr. Weberbauer 

 as bluish, a statement questioned by Hieronjmus. Cook & Gilbert 

 give the flower-color of their no. 369 as "pale wistaria violet" and of 

 their no. 589 as "pale blue." In the dried material of both of these 

 numbers the limb and upper part of the throat of the corollas still show 

 in the dried material a pale purple coloration. 



In regard to the recorded Peru\ian occurrence of E. salicinum, see 

 below (p. 87). 



24. E. GLOMERATLTVi DC. Suffruticose, shortly but rather coarsely 

 spreading-pubescent; branches terete, leafy to the inflorescence; inter- 

 nodes 6 cm. or more long; leaves opposite, ovate-lanceolate, acuminate 

 to scarcely acute, crenate-dentate except at base, where cordate by an 

 open sinus, slightly pubescent above, softly but not very densely sordid- 

 tomentose and somewhat veiny beneath, 4-6 cm. long, 2-3 cm. wide; 

 petiole slender, 8-14 mm. long; globose glomerules 1-3 cm. in diameter, 

 terminal on the divaricate branches of a leafy-bracted open ovoid or 

 subpyramidal panicle; heads sessile, 7-8-flowered; involucre subcyl- 

 indric-campanulate, the scales brownish-stramineous, striate, the inner 

 oblong, obtuse, essentially glabrous, the outer progressively shorter, 

 ovate, somewhat hairy dorsally near the blunt or rounded tip. — Prod. 



