290 PROCEEDINGS OF THE AMERICAN ACADEMY. 



rotund with a longitudinal hilar ridge on the ventral surface, scrobicu- 

 late, — Proc. Am. Acad. xvii. 202. — Northern Mexico, Coahuila, in 

 the region of Saltillo, Palmer, nos. 397, 398, and in the same State on 

 limestone hills, Carneros Pass, Pringle, no. 2381. 



++ i-f Leaves much reduced : capsule about 2 mm. long. 

 H. longipes, Watson. Erect, much branched, 1 to 2^ dm. hi^h : 

 stems and branches subterete, slender, glabrous or below granular-hirtel- 

 lous: leaves linear-filiform, 4 to 10 mm. long, glabrous ; stiimles minute: 

 flowers small, " whitish and yellowish," 8 mm. long, on slender filiform 

 pedicels : calyx-divisions linear, about 1 mm. long, obtusish and submu- 

 cronate : corolla f unnelform, upper portion of tube pubescent within ; 

 lobes pilose-pubescent above : capsule small, subrotund ; seeds saucer-like 

 or subcrateriforra with a longitudinal ridge on the hilar surface, scrobic- 

 ulate. — Proc. Am. Acad, xviii. 97. — Near Mouclova, Coahuila, Palmer, 

 no. 394, and by the same collector at Monterey, Nueva Leon, no, 395 ; 

 also by Dr. Gregg at Cerralbo, collected 29 May, 1847. 



H. brevipes, Rose. A low much branched distinctly suffrutescent 

 plant, 2 to 3 dm. high, glabrous throughout, somewhat glaucous : branches 

 slender, terete: leaves linear-filiform, 10 to 15 mm. long; stipules short, 

 1-4-setiform : flowers sessile or on slender pedicels : calyx deeply 4- 

 lobed, with a stipitate gland in each sinus : divisions in anthesis about 

 1 mm. long: corolla salverform, 10 to 15 mm. long ; tube slender, slightly 

 enlarged above ; lobes glabrous above : capsule subglobose ; seeds oblong, 

 peltate, cancavo-convex, minutely scrobiculate. — Contrib. U. S. Nat. 

 Herb. i. 83, 132. — Lower California, Santa Rosalia, Palmer, no. 202 ; 

 Carmen Island, Palmer, no. 836 ; also specimen in Gray Herbarium from 

 Lower California, apparently from the herbarium of Dewey, without 

 further data. 



§ 2. Ereicotis. Fruticose or fruticulose plants with linear subterete 

 rigid-setaceous or acerose-linear leaves : capsule short-oblong, obtuse or 

 retuse ; seeds open-crateriform or oblong, peltate, minutely scrobiculate. — 

 Gray, Proc. Am. Acad. xvii. 203. 



* Low, 2 to 18 cm. high, much branched from a woody perennial base : leaves 



rigid-setaceous or acerose-linear. 



H. acerosa, Gray. A low diminutive cespitose shrub : branches as- 

 cending or erect, strict, striate, hispidulous: leaves opposite or in threes 

 or fours, 5 to 12 mm. long, connected at the base by a stipular setiferous 

 cup, more or less hispid and ciliate : flowers sessile at the ends of thi 

 branches and branchlets : calyx deeply 4-parted ; divisions setaceous, 

 4 mm. long, hispidulous : corolla-tube slender, about 1 cm. long, dilated 



