80 ROBINSON. 



I. c. The following are with some doubt referred here: Loreto: 

 Tarapoto, 1835, Mathnos, no. 1417 (K.), and Amazonas: Prov. Cha- 

 chapoyas, Mathews (K.). 



Persistent effort has thus far failed to disclose in North American 

 herbaria any material which can with entire confidence be placed in 

 this species. It is hard to understand just why Hieronymus takes 

 the trouble to distinguish the plant from the geographically remote 

 and as to habit dissimilar E. pruneUaefolium HBK. of Mexico, yet 

 appears to feel no obligation to point out the much-needed distinctions 

 between E. articukUum and the closely related E. vallincola DC. and 

 E. inchinchcnsc HBK. of similar Andean distribution. While it is 

 impossible at present to unite these species, the types of which appear 

 to differ in several minor features, the characters thus far known to 

 separate them are exceedingly trifling, such as pubescence, length of 

 the petiole, number and size of the teeth of the leaves, etc., matters 

 in which considerable variation has already been observed. 



70. E. PROBUM N. E. Brown. Herbaceous (at least above), much 

 branched and very leafy, covered throughout with soft gland-tipped 

 and viscid hairs; stems round, weak, pithy; leaves opposite or the 

 upper subalternate, ovate, acute to acuminate, the cauline rounded 

 to truncate or open-cordate at base, serrate (teeth about 7 on each 

 side), thin, green and thinly pubescent on both surfaces, 3-nerved 

 from the very base (the nerves villous beneath), 2-4.5 cm. long, 1.3-3 

 cm. wide, delicately membranaceous; petiole 1.5-2.5 cm. long, glan- 

 dular-pubescent; corymbs terminal, fastigiately branched, flatfish 

 topped, sometimes 1 dm. in diameter, 12-15-headed, sometimes 

 much smaller and only 1-5-headed; pedicels (in greenhouse material) 

 2-5 cm. long; heads 80-100-flowered, 12 mm. high and thick; invo- 

 lucre about 2-seriate, campanulate, the scales about 20, lance-linear, 

 acute, thin, green and pubescent toward the mostly 2-ribbed base, 

 scarious on the margin and toward the tip; corollas white, slightly 

 puberulent on the short limb, the tube about 1.7 mm. long, slender, 

 the throat subcylindric-campanulate, 3 mm. long; achenes upwardly 

 hispid on the angles, about 2.5 mm. long, crowned by a shallow stra- 

 mineous saucer-shaped disk; pappus-bristles bright white, delicate, 

 nearly smooth. — Gard. Chron. ser. 3, vii. 321, fig. 48 (1890). — Peru: 

 introduced into horticulture about 1870 by Mr. Wilson Saunders, who 

 raised it from seed collected presumably in Peru by Mr. Farris. The 

 cultivated specimen from which the abo^'e character is drawn is in 

 the herbarium at Kew. It has thus far proved impossible to match 

 it with anv material collected in Peru. 



