334 BRASSICACEAE 



1. S. aquatica L. Submerged perennial; leaves 10-20, erect or nearly so, 

 2-7 cm. long, subulate; scape 2-10 cm. long; submersed flowers cleistogamous ; 

 fruit obovate. Ponds: Newf.—N.H.— Calif.— B.C. Mottt. 



12. CAMELINA Crantz. Fal.se Flax. 



Annual caulescent herbs, glabrous or with branching hairs. Leaves alternate, 

 entire or toothed, often clasping. Flowers perfect, in elongate racemes. Sepals 

 equal. Petals yellowish or greenish. Pod short, inflated, nearly terete, obovoid; 

 valves 1-nerved; style slender; stigma capitate. Seeds in two rows, usually few, 

 marginless. Cotyledons incumbent. 



Stem glabrous. 1. C. saliva. 



Stem pubescent. 2. C. microcarpa. 



1. C. sativa (L.) Crantz. Stem 3-6 dm. high, branched above; lower leaves 

 petioled, 5-S cm. long, lanceolate; upper stem-leaves sagittate at the base and 

 clasping; petals light yellow, 5-6 mm. long; pod pear-shaped 6-8 mm. long. 

 Waste places: N.S. — N.Y. — Calif. — Mont.; adv. from Eu. Plain — Submont. 

 Jo-Jl. 



2. C. microcarpa Andrz. Stem 3-6 dm. high; lower leav^es lanceolate, more 

 or less hirsute; stem-leaves sagittate at the clasping base; petals about 4 mm. 

 long; pod 4-6 mm. long, pear-shaped, strongly margined. Waste places: R.I. — • 

 Va. — Ariz. — B.C.; nat. from Eu. Plain — Submont. My-Jl. 



13. NESLIA Desv. 



Leafy-stemmed annuals. Flowers perfect. Sepals short, equal at the base. 

 Petals spatulate, clawed. Stamens 6, free and unappendaged. Fruit globose, 

 indehiscent, usually 1-celled by obliteration of the partition; stjde elongate; 

 stigma simple. Seeds 1 or 2, neither winged nor margined. Cotyledons in- 

 cumbent. 



1. N. paniculata (L.) Desv. Slender branched annual; stems 3-6 dm. 

 high, rough-hispid; leaves lanceolate, sagittate at the base, 2-6 cm. long; racemes 

 elongate in fruit; petals bright yellow, 2 mm. long; pod subglobose, reticulate 

 and muricate, about 2 mm. thick. Waste places: Que. — S.D. — -B.C.; adv. from 

 Eu. Plain — Submont. Jl-Au. 



14. ARMORACIA Gaertn. Horse-radish. 



Tall glabrous perennials, with thick pungent taproot and leafy stem. Leaves 

 crenate or sinuately lobed. Flowers perfect, in dense racemes or panicles. 

 Petals white, clawed. Stamens 6, free and unappendaged. Pod short, round- 

 ellipsoid or subglobose; style short; stigma subcapitate. 



1. A. Armoracia (L.) Cockerell. Stem 6-10 dm. high; basal leaves 1.5-3 dm. 

 long, glabrous, oblong; stem-leaves lanceolate, serrate or crenate; flowers 4-8 mm. 

 wide, showy. Nasturtium Armoracia Fries. Around dwellings: Que. — Fla.— 

 Tex.— Mont.; escaped from cultivation. Jl-S. 



15. RADICULA Hill. Yellow Water-cress, Marsh-cress. 



Annual or perennial herbs, of wet situations. Leaves alternate, pinnately 

 dissected or lobed. ^lowers perfect, in terminal or axillary racemes. Sepals 

 spreading during anthesis. Petals yellow, or rarely white or wanting, clawed. 

 Stamens 2-6. Pods terete, from subglobose to short-cylindric; valves usually 

 l-nerved. Seeds in 2 rows, turgid. Cotyledons accumbent. [Nasturtium R. 

 Br., in part. Roripa Scop.] 



Perennials with rootstocks; petals much exceeding the sepals. 

 Pods papillose. 



Pods ovate; leaves coarsely toothed. 1. R. calycina. 



Pods lance-oblong or linear, mostly curved; leaves pinnatifld. 



Leaves tliin; petals wliite; fruit recurved. 2. R. trachycarpa. 



Leaves tiiick; petals yellow; fruit erect. 3. R. Columbiae. 



Pods not papillose. 4. R. sinuata. 



