252 CHENOPODIACEAE 



15. SALSOLA L. 



.TW 



^ Annual or perennial herbs, or shrubs, bushy-branched, with narrow, entire, 

 spine-tipped, rigid leaves. Flowers perfect, solitary or several together in the 

 axils, with 2 bractlets. Sepals 5, appendaged with a horizontal wing at matur- 

 ity. Stamens 5, rarely less; filaments Unear or subulate. Ovary 1-celled, more 

 or less depressed; styles 2, Utricle flattened; seeds erect; endosperm wanting; 

 embrj^o spiral in form of a cone. 



1. S. Pestifer A. Nels. Divaricately branched annual; stem 3-10 dm. high; 

 leaves fihform, somewhat fleshy, 2-6 cm. long, spine-tipped; bracts subulate, 

 5-10 mm. long, with stout spines; calyx membranous, conspicuously veiny, 6-7 

 mm. in diameter. S. Tragus Reichenb., not L. Waste places, fields, and loose 

 sandy sod: Ont.— N.J,— Tex.— Calif.— Wash. PlainSuhmonL Jl-S. 



16. DONDIA Adans. Sea Bute. 



Annual or perennial herbs, or shrubby plants, more or less fleshy, with al- 

 ternate, narrow, terete leaves. Flowers perfect or polygamous, solitary or 

 clustered in the upper axils, bracteate. Sepals 5, keeled or narrowly winged at 

 maturity. Stamens 5; filaments short. Ovary 1-celled, rounded or flat on the 

 top; styles often 2. Utricle surrounded by the calyx; seeds horizontal or vertical; 

 endosperm wanting or scant. Embryo coiled in a flat spiral. [Stvaeda Forskal.] 



Sepals more or less fleshy, but none of them carinate; leaves narrowed at the base. 

 Plant perennial, stout. 



Seeds tubercled. 1. D.Torremna. 



Seeds not tubercled. 2. D, intermedia. 



Plant annual, more slender. 3 jy niora 

 Sepals very fleshy, one or two decidedly carinate. 



Leaves subulate, broadest at the base; flowers crowded 



Plant depressed, spreading. 4, />, depressa. 



Plant erect, strict. 5 j> erecta 

 Leaves narrowed at the base; spike slender; flowers not crowded. 6.' D. occide'ntalis , 



1. D. Torreyana (S. Wats.) Standi. Undershrub, woody at the base; herbace- 

 ous branches 6^10 dm. high, glabrous or somewhat pubescent, with strongly 

 ascending branchlets; leaves subterete, filiform, 1-4 cm. long, acute; bracts similar 

 but shorter; calyx deeply cleft; seeds L5 mm. broad. Sivaeda Torreyana S. Wats. 

 b.Moqum (Torr.) A. Nels., in part. Salt marshes: Wyo.— Tex,— N.M.—Calif. 

 — j\ ev. Son, — SubmonL Je-S. 



2. D. intermedia (S. Wats.) Heller. Undershrub, woody at the base; 



herbaceous branches 2-5 dm. high, glabrous, with branchlets ascending but not 



strongly so; leaves narrowly linear, narrowed at the base, 1-2 cm. long; bracts 



shorter and broader; calyx deeply cleft, not appendaged; seeds small, less than 



1 mm. broad. Swaeda intermedia S. Wats. Alkaline soil; Ida.— Utah— Ariz.— 

 Cahf. Son, 



3. D. nigra (Raf.) Standi. Erect or ascending annual; stem diffusely 

 branched, 3-5 dm. high; branches long and flexuose; leaves fiUform, terete, 1-3 

 cm. long, acute; bracts similar^ but much shorter, usually less than 1 cm. long; 

 calyx cleft to just below the middle, fleshy; seeds vertical, 1 mm. broad, smooth. 

 Swaeda diffma S. Wats. D. diffusa (S. Wats.) Heller. Sage plains and alka- 

 line soil: Wyo.-^N.M.— Ariz.— Ore.; n Mex. Plain. Jl-S. 



4. p. depressa (Pursh) Britton. Low and decumbent annual; stems 

 branching at the base, 2-10 dm. long; leaves Unear, subulate, 1-3 cm. long; bracts 

 5-10 mm. long, rather crowded on the branchlets; calyx cleft to the middle; 

 seeds about 1 mm. broad, slightly reticulate. Chenopodium calceolariforme 

 Hook. Swaeda depressa S. Wats. Dondia calceolariformis Rydb. Saline or 

 alkahne soil: Sask.— Kans.— Xev.— Mont. Plain— SubmonL J1~S. 



■ u* ?* erecta (S, Wats) A. Nels. Erect annual; stems rather simple or 

 with short erect branches, ver}' leafy; leaves slender, 2-4 cm. long; bracts often 

 more than 1 cm. long; calyx cleft below the middle; seeds smooth, nearly 1.5 mm. 



broad. Alkahne or saline .flats: Sask.— Colo.— Xev.— Mont, Plain—MonL 



Jl^S. 



