CRUCIFER^. (mustard FAMILY.) 69 



1. L. globosa, Watson. Minutely hoary all over ; stems spreading or de- 

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

 a tapering base, repand-toothed or nearly entire ; raceme at lengtli elongated, 

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

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

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



2. L. gracilis, Watson. Annual, slender ; pul)escence 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 southwestward. 



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")"'^'' dwarf, and xLvov, 

 flax.) 



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

 margined, large. A weed in tiax-fields, etc. (xVdv. from Eu.) 



10. SUBULARIA, L. Awlwort. 



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

 Seeds several. Cotyledons long and narrow, incum])ently folded transversely, 

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

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

 the name). Scape naked, few-flowered, 1 -3' liigh. Flowers minute, Avhite. 



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, K.Br. Water-Cress. 



Pod a short silKjue 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 Nasiis tortus, a convulsed nose, alluding to the effect of its pun- 

 gent qualities.) 



§ 1. Petals ichite, twice the length of the ca/ijx; pods linear; leaves pinno/e. 



N. officixXle, R. Br. (True Water-Cress.) Perennial; stems spread- 

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

 long) ast'ending on slender widely spreading pedicels. — Brooks and ditcher ; 

 escaped from cultivation. (Nat. from Eu.) 



§ 2. Petals jjelloiv or yelloicish, seldom much exceeding the calijx ; pods linear, 

 oblong, or even ovoid or globidar ; leaves mostljj pinnatifld. 



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



N. sylvestre, R. Br. (Yellow Cress.) Stems ascending; leaves pin- 

 nateltj parted, tlie divisions toothed or cut, lanceolate or linear; pods (^ long) 



