ON A GRA CEA E. 663 



Fruit 10-14 mm. long, the body much longer than thick. 



Leaves mostly glabrous; fruit 14 mm. long* glabrous, its stout pedicel club- 

 shaped. 5. G. sinuata. 



Leaves densely villous; fruit 10 mm. long, pubescent, its slender pedicel nearly 

 filiform. 6. G. villosa. 



1. Gaura parviflora Dougl. Small-flowered Gaura. (I. F. f. 2603.) 

 Erect, villous-pubescent with whitish hairs, 6-15 dm. high. Leaves lanceolate or 

 ovate-lanceolate, acute or acuminate, repand -denticulate, softly pubescent, 3.5- 

 10 cm. long; spikes elongated; flowers pink, the ovary and calyx-tube slender; fruit 

 contracted at the base, 4-nerved, obtusely 4-angled, glabrous or nearly so, 6-8 mm. 

 long. In dry soil. S. Dak. to Mo., La., Mex., Ore. and N. Mex. May- Aug. 



2. Gaura coccinea Pursh. Scarlet Gaura. (I. F. f. 2604.) Erect or 

 ascending, much branched, canescent or glabrate, 1.5-6 dm. high. Leaves oblong, 

 lanceolate, or linear-oblong, denticulate, repand or entire, acute or obtuse at the 

 apex, 1.2-3.5 cm - l° n g; flowers red, turning scarlet; fruit terete below, 4-sided 

 and narrowed above, canescent, 6-8 mm. long. Prairies and dry soil, Manitoba 

 and Minn, to Neb., Tex., Mont., Utah, Ariz, and in Mex. May- Aug. 



3. Gaura biennis L. Biennial Gaura. (I. F. f. 2605.) Erect, villous or 

 downy-pubescent, 6-15 dm. high. Leaves lanceolate or oblong-lanceolate, acute 

 or acuminate at each end, remotely denticulate, 5-10 cm. long; spikes slender; 

 flowers white, turning pink, 8-10 mm. broad; fruit narrowed at each end, 

 4-ribbed, villous, 6-8 mm. long. In dry soil, Quebec and Ont. to Minn., Ga., 

 Tenn. and Miss. July-Sept. 



4. Gaura Michauxii Spach. Michaux' Gaura. (I. F. f. 2606.) Erect, 

 glabrous or nearly so, paniculately branched above, 6-18 dm. high. Leaves 

 linear or linear-oblong, acute or acutish at both ends, or obtuse at the apex, sinu- 

 ate or denticulate, 2.5-8 cm. long; racemes loosely flowered, long-peduncled; 

 flowers pedicelled, white, turning reddish, 6-8 mm. broad; fruit ovoid, 4-angled 

 above, borne on a pedicel of nearly or quite its own length. In dry fields, Va. 

 to III., Kans., Fla. and La. July-Aug. 



5. Gaura sinuata Nutt Wavy-leaved Gaura. (I. F. f. 2607.) Erector 

 decumbent, glabrous, or rarely sparingly villous. Stem branched at the base, 

 3-9 dm. tall, usually naked above; leaves oblanceolate to lanceolate, or nearly 

 linear, sinuate-toothed, 2.5-8 cm. long, acute; calyx slightly pubescent, its tube 

 funnelform, 2-4 mm. long; petals 8-10 mm. long; fruit 4-ridged and 4-grooved 

 above the club-shaped pedicel. In dry soil. Kans. to Ark. and Tex. May-July. 



6. Gaura villosa Torr. Woolly Gaura. (I. F. f. 2608.) Erect or nearly 

 so, canescent or villous. Stems 3-9 dm. tall, often naked above; leaves varying 

 from lanceolate to oblanceolate or sometimes nearly linear, 2.5-7.5 cm. long, sinu- 

 ate-toothed or pinnatifid, acute or acuminate; calyx canescent, its tube funnelform, 

 2-4 mm. long; petals 10-14 mm. long; body of the fruit sharply 4-angled. abruptly 

 narrowed into a filiform pedicel. In dry soil, Kans. to Ark. and Tex. June-Sept. 



19. STENOSIPHON Spach. 



Erect perennial herbs, with alternate sessile narrow leaves, and white flowers in 

 elongated terminal spikes. Calyx-tube filiform, much prolonged beyond the 

 ovary, 4-lobed. Petals clawed. Stamens 8, declined, not appendaged by scales at 

 the base. Ovary i-celled; stigma as in Gaura. Fruit 8-ribbed, indehiscent, 

 i-celled, i-seeded. Seed pendulous. [Greek, referring to the slender calyx-tube. J 

 A monotvpic genus of the south-central U. S. 



1 Stenosiphon linifolium (Nutt.) Britton. FLAX-LEAVED Stenosiphon. 

 (I. F. f. 2609.) Slender, glabrous, 6-15 dm. high. Leaves lanceolate, linear- 

 lanceolate or linear, acuminate or acute at the apex, entire, 2.5-5 cm - lon g; ppikes 

 dense, narrow, sometimes 3 dm. long in fruit; flowers 8- 1 2 mm. broad: calyx-tube 

 very slender. 8-10 mm. long; fruit ovoid, pubescent, 2-3 mm. long, very much 

 shorter than the linear-subulate bracts. Prairies, Neb. and Colo, to the Ind. Terr, 

 and Tex. June-July. 



20. CIRCAEA L. 



Low slender perennial herbs, with opposite petioled leaves, and small white 

 flowers in racemes. Calyx- tube slightly prolonged beyond the ovary, its limb 



