118 PROCEEDINGS OF THE AMERICAN ACADEMY. 



petioles 1^-1^ inches loug, often somewhat winged or lobed near the 

 summit: terminal inflorescences about 2 inches long, rather closely 

 flowered, staminate, except at the very base ; inflorescences springing 

 from the upper axils several, very short, chiefly fertile ; $ pedicels 

 flexuous, 2 lines long, white tomentose and not at all glandular ; invo- 

 lucres cinereous, rotate, 2 lines in diameter, unequally 9-10-toothed, 20- 

 flowered ; teeth obtuse ; 9 involucres at first ovoid, acute, 2-beaked, 

 2-celled ; spines (scales) about 24, appressed, imbricated ; achenes sol- 

 itary in each cell ; fruit 2i lines long, puberulent and finely glandular, 

 corrugated toward the narrowed base ; the spines spreading, | line long. 

 — Collected on plains near Casas Grandes, Chihuahua, by Mr. Hart- 

 man, 10 October, 1891 (no. 813). 



Encelia oblonga. Fruticose, 2-3 feet high : branches grayish, 

 nearly or quite smooth, finely striated ; branchlets glabrous or hirsute, 

 resiniferous : leaves attenuate, subsessile, oblong or oblanceolate, puber- 

 ulent, green upon both surfaces, scabrously ciliolate-denticulate, rounded 

 or obtuse and mucronate at the apex, cuneate at the base, l:j-2^ inches 

 long, 6-12 lines broad ; veinlets translucent : peduncles solitary, termi- 

 nal, sparingly hirsute, 2-3 inches in length, with 2-3 reduced leafy bracts 

 and a solitary head about an inch in diameter exclusive of the rays : 

 involucral bracts in two series, subequal, lanceolate, caudate-attenuate, 

 ciliolate, 5-6 lines long: rays 12-15, yellow, nearly half an inch in 

 length : disk corollas with throat cylindrical, 2 lines long, much exceed- 

 ing the short proper tube and still shorter glabrous limb : achenes 

 2\ lines long, appressed silky villous and crowned with two weak un- 

 equal readily deciduous ciliolated awns ; the larger one, on the side 

 opposite the enclosing palea, two thirds as long as the corolla. — 

 Collected on plains near Casas Grandes, Chihuahua, by Mr. Hartman, 

 10 October, 1891 (no. 812). 



Leptosyne Arizonica, Gray, var. pubescens. Soft pubescent 

 throughout : leaves tending to have somewhat broader segments : not 

 otherwise differing from the glabrous type. — Collected at Granados, 

 Sonora, at 2,950 feet, by Mr. Hartman, 15 November, 1890 (no. 222); 

 near Huchuerachi, at 4,000 feet, by the same collector, 5 December, 

 1890 (no. 296) , and at Cardovas, Sonora, by Mr. Lloyd, 9 December, 

 1890 (no. 406). 



Perityle Lloydii. Suffruticose, branching from the base. 4-10 

 inches high, cinereous-pubescent, very glandular and aromatic : 

 branches slender, terete, more or less decumbent : leaves opposite 

 below, subalternate above, ovate-deltoid, acute, somewhat doubly 

 dentate, 8-12 lines long, pubescent upon both surfaces; petioles 



