CRUCIFER^:. (MUSTARD FAMILY.) 69 



1. Ii. globdsa, Watson. Minutely hoary all over; stems spreading or de- 

 cumbent from an annual or biennial root ; leaves oblong or lanceolate with 

 a tapering base, repaud-toothed or nearly entire ; raceme at length elongated, 

 with filiform diverging pedicels; petals light yellow; style filiform, much 

 longer than the small globose, acutish, about 4-seeded pod ; seeds marginless. 

 (Vesicaria Shortii, Torr.) Rocky banks, Ky. to Tenn. and Mo. May, June. 



2. L. graeilis, Watson. Annual, slender ; pubescence very fine ; leaves 

 narrowly oblanceolate ; pods glabrous, suberect on ascending or curved pedi- 

 cels, stipitate; style long. (Vesicaria gracilis, Hook.) S. Kan. to Tex. 



3. L. Ludoviciana, Watson. Biennial or perennial ; pubescence com- 

 pact ; leaves linear-oblanceolate, mostly entire ; pods pubescent, pendulous on 

 recurved pedicels; style long. (Vesicaria Ludoviciana, DC.) Minn, to 

 Neb. and south west ward. 



9. CAMELINA, Crantz. FALSE FLAX. 



Pod obovoid or pear-shaped, pointed, flattish parallel to the broad parti- 

 tion ; valves 1 -nerved. Seeds numerous, oblong. Cotyledons incumbent. 

 Style slender. Flowers small, yellow. (Name from x a f jia/l ) dwarf, and \lvov, 

 flax.) 



C. SATIVA, Crantz. Annual ; leaves lanceolate and arrow-shaped ; pods 

 margined, large. A weed in flax-fields, etc. (Adv. from Eu.) 



10. SUB TIL ARIA, L. AWLWORT. 



Pod ovoid or globular, with a broad partition ; the turgid valves 1 -nerved. 

 Seeds several. Cotyledons long and narrow, incumbently folded transversely, 

 i. e., the cleft extending to the radicular side of the curvature. Style none. 

 A dwarf stemless perennial, aquatic ; the tufted leaves awl-shaped (-whence 

 the name). Scape naked, few-flowered, 1 -3 / high. Flowers minute, white. 



1 . S. aquatica, L. Margin of lakes in Maine ; Echo Lake, Franconia, 

 N. H. ; also in alpine regions of the western mountains. June, July. (Eu.) 



11. NASTURTIUM, R. Br. WATER-CRESS. 



Pod a short silique or a silicle, varying from oblong-linear to globular, 

 terete or nearly so ; valves strongly convex, nerveless. Seeds usually numer- 

 ous, small, turgid, marginless, in 2 irregular rows in each cell (except in N. 

 sylvestre). Cotyledons accumbent. Aquatic or marsh plants, with yellow or 

 white flowers, and commonly pinnate or pinnatifid leaves, usually glabrous. 

 (Name from Nasus tortus, a convulsed nose, alluding to the effect of its pun- 

 gent qualities.) 



1. Petals white, twice the length of the calyx ; pods linear ; leaves pinnate. 



N. OFFICINXLE, R.Br. (TRUE WATER-CRESS.) Perennial; stems spread- 

 ing and rooting ; leaflets 3-11, roundish or oblong, nearly entire ; pods (6 - 8" 

 long) ascending on slender widely spreading pedicels. Brooks and ditches ; 

 escaped from cultivation. (Nat. from Eu.) 



2. Petals yellow or yellowish, seldom much exceeding the calyx ; pods linear , 



oblong, or even ovoid or globular ; leaves mostly pinnatifid. 

 * Perennial from creeping or subterranean shoots; flowers rather large, yellow. 



N. SYLVESTRE, 11. Br. (YELLOW CRESS.) Stems ascending ; leaves pin- 

 nately parted, the divisions toothed or cut, lanceolate or linear ; pods ( J' long) 



