VOL. II.] 



i. Stenosiphon linifolium 



(Nutt.) Britton. Flax-leaved 



Stenosiphon. (Fig. 2609.) 



Gaura linifolia Nutt. in Long's Exp. 2: 

 loo. 1823. 



Stenosiphon virgatus Spach, Nouv. Ann. 

 Mus. Par. 4: 326. 1835. 



Stenosiphon linifolium Britton, Mem. 

 Torr. Club, 5 : 236. 1894. 



Erect, slender, glabrous, 2-5 high. 

 Leaves sessile, lanceolate, linear-lan- 

 ceolate or linear, acuminate or acute at 

 the apex, narrowed or rounded at the 

 base, entire, i / -2 / long, the upper ones 

 much smaller; spikes dense, narrow, 

 sometimes i long in fruit; flowers 

 white, 4 // -6 // broad; calyx-tube very 

 slender, 4 // ~5 // long; fruit ovoid, pu- 

 bescent, i"-i%" long, very much 

 shorter than the linear-subulate bracts. 



Prairies, Kansas and Colorado to the 

 Indian Territory and Texas. June-July. 



EVENING-PRIMROSE FAMILY. 



499 



20. CIRCAEA L> Sp. PI. 9. 1753. 



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

 fect flowers in terminal and lateral racemes. Calyx-tube hairy, slightly prolonged beyond 

 the ovary, its limb 2-parted. Petals 2, obcordate, inserted on the perigynous disk. Stamens 

 2, alternate with the petals; filaments filiform. Ovary i-2-celled; united styles filiform; 

 stigma capitate; ovules usually i in each cavity. Fruit obovoid, small, indehiscent, densely 

 bristly with hooked hairs, i-2-celled. [Named for Circe, the enchantress.] 



About 5 species, natives of the northern hemisphere. Besides the following, another occurs 

 on the Pacific Coast. 



Plant i-2 high; leaves ovate; hairs of the fruit stiff. 

 Plant 3' -8' high; leaves cordate; hairs of the fruit weak. 



1. C. Lutetiana. 



2. C alpina. 



i. Circaea Lutetiana L,. Enchanter's Nightshade. (Fig. 2610.) 



Circaea Luletiana L. Sp. PI. 9. 1753. 



Erect, branching, finely pubes- 

 cent, at least above; stem swollen 

 at the nodes, i-2 high. Leaves 

 slender-petioled, ovate, acuminate 

 at the apex, rounded or rarely 

 slightly cordate at the base, re- 

 motely denticulate, 2 / -4 / long; pedi- 

 cels 2 // -4 // long, slender, spread- 

 ing in flower, reflexed in fruit; 

 bracts deciduous ; flowers about i ]/ z ff 

 broad; fruit broadly obovoid, nearly 

 2 //r long, densely covered with stiff 

 hooked hairs. 



In woods, Nova Scotia to western 

 Ontario, south to Georgia, Nebraska 

 and Missouri. Also in Europe and 

 Asia. Ascends to 2000 ft. in Virginia. 

 Called also Bindweed Nightshade. 

 June-Aug. 



