64 CRUCIFERJE. (MUSTAED FAMILY.) 



III. LOMENTACE2E. Pod articulated, separating across into joints. 



Tribe VII. CAKH.INEJE. Cotyledons plane and accumbent, as in Tribe 1. 



19. Cakile. Pod short, 2-jointed : the joints 1-celled and 1-seeded. 



Tribe VIII. RAPHANE^E. Cotyledons conduplicate and incumbent, as in Tribe 3. 



20. Rapliaiius. Pod elongated, several-seeded, transversely intercepted. 



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



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

 or nearly so. Seeds small, turgid, marginless, in 2 irregular rows in each cell 

 (except in No. 2). 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 pungent qualities.) 



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



1. N. OFFICINALE, R. Br. (TRUE WATER-CRESS.) Stems spreading and 

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

 ascending on slender widely spreading pedicels, ty 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, bright yellow. 



2. N. SYLVESTRE, R. Br. (YELLOW CRESS.) Stems ascending; leaves 

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

 on slender pedicels, linear and narrow, bringing the seeds into one row ; style 

 very short. Wet meadows, Massachusetts to Virginia: rare. (Nat. from Eu.) 



3. N. Sinuktum, Nutt. Stems low, diffuse; leaves pinnately cleft, the 

 short lobes nearly entire, linear-oblong; pods linear-oblong (4" -6" long), on 

 slender pedicels ; style slender. Banks of the Mississippi and westward. June. 



* * Annual or biennial, rarefy perennial? with simple fibrous roots : flowers small or 



minute, greenish or yellowish : leaves somewhat lyrate. 



4. N. sessilifldrum, Nutt. Stems. erect, rather simple; leaves obtusely 

 incised or toothed, obovate or oblong ; flowers minute, nearly sessile ; pods elon- 

 gated-oblong (5" - 6" long), thick ; style very short. W. Illinois to Tennessee 

 and southward. April -June. 



5. N. obttlSUin, Nutt. Stems much branched, diffusely spreading ; leaves 

 pinnately parted or divided, the divisions roundish and obtusely toothed or repand ; 

 flowers minute, short-pedicelled ; pods longer than the pedicels, varying from linear- 

 oblong to short-oval ; style short. With No. 3 and 4. 



7. N. paltistre, DC. (MARSH CRESS.) Stem erect; leaves pinnately 

 cleft or parted, or the upper laciniate ; the lobes oblong, cut-toothed ; pedicels 

 about as long as the small floivers and mostly longer than the oblong, ellipsoid, or 

 ovoid pods ; style short. Wet places or in shallow water ; common. June- 

 Sept. Flowers only l"-l" long. Stems l-3 high. The typical form 

 with oblong pods is rare (W. New York, Dr. Sartwell). Short pods and hirsute 

 stems and leaves are common. Var. HISP^DUM (N. hispid um, DC.) is a form, 

 with ovoid or globular pods. (Eu.) 



