36 OHUEK 11. CRUCIFER^E. 



1. NASTURTIUM, R. Br. WATER-CRESS. (Lat. naxus tortm, uose 

 tortured ; alluding to the pungent qualities.) Sep. spreading. Siliquea 

 subterete, turgid, generally curved upward, often shortened to a silicle, 

 valves veinless. Seeds small, oo, turgid, generally arranged in a double 

 row in each cell (= o ). x? with pinnate or pinnatifid leaves. 



* Petals white. Siliques rather long (10 12") No. 1 



* Petals yellow, tninute. Siliques shortened (4 8"), but longer than the pedicels, (a) 



* Petals yellow. Siliques or silicles (1 6"), shorter than the pedicels. (b) 



& Leaves pinnate or phmatiad. Diffusely branched Nos. 2, 3 



a Leaves lyrate, or merely toothed. Stems erect Nos. 4, 5 



b Petals not longer than the calyx, obscure Nos. 6, 7 



b Petals longer than the calyx, bright yellow, the flowers showy Nos. 8, 9 



1 N. ofHciiiJUc R. Br. English W. Lvs. pinnate, Ifts. ovate, subcordate, repand ; 



roils white, longer than the calyx, if Springs, &c. May, June. 



2 N. taaacetifolium Hook. Upper leaf-segm. confluent, lower distinct, oblong, or 



roundish, sinuate- toothed, teeth obtuse ; pods 4 b ', ped. J a-s long. @ South. 

 /3. vbinxiim. Lfts. mostly distinct, obtuse, oval. Pods shorter (3 5"). Miss. R. 



3 N. Walter! Wood. Segments of the leaves all distinct, narrow, with a few linear, 



acute lobes or teeth ; pods linear (5"), ped. 23". V South. 35'. March, April. 



4 N. limosum N. Lvs. lanceolate, toothed, the lower lyrate ; pods elliptic-oblong, 



3 4", ped. much shorter, (f) Rivers. La. 10 15'. Fls. minute. Too near the next. 



5 ft. sessiliflorum N. Lvs. wedge-obovate, repandly-toothed or subentire ; pods 



linear-oblong, 56", subsessile. Miss. Riv. Stem erect. Fls. minute. Apr.- -Tune. 



6 N. palustre DC. Marsh Cress. Glabrous; Ivs. piunately lobed, amplexicaul, lobes 



confluent, dentate ; rt. fusiform ; pet. as long as the sepals ; silicle spreading, turgid, 

 twice longer than wide, li Wet places. 1 2f. Pod 3". June Aug. 



7 N. hispidum DC. Villous : Ivs. runciuate-pinnatifld, lobes obtusely dentate ; sili- 



cles tumid, ovoid, or globular, the pedicels longer, ascending; pet. scarcely as long as 

 the calyx. (2) Streams, 1 3f. Pod 1". Ped. 23". June Aug. 



8 N. sylvestre R. Br. Wood Cress. Lvs. pinnately divided, segm. serrate or incised ; 



pods linear, style very short. U Meadows, Ms. to Pa. Rare. June, July. 



9 N. Mimiatiim Nutt. Lvs. pinnatifid, segm. lance-oblong, nearly entire; pods 



oblong, acute, with a slender style. "U. Rivers, St. Lor.is to Oreg. June. 



2. TURRITIS, Dill. TOWER MUSTARD. (Lat. turris, a tower; from 

 the strict form of the plants.) Sep. erect, converging. Seeds flattened, 

 minute, in 2 rows in each cell of the long, narrowly-linear 2-edged silique ; 

 valves plane, 1 -veined. Embryo = c . Glabrous and strictly erect, stem- 

 leaves sagittate-clasping. (Runs into Arabis.) 



1 T. glabra L. Fls cream-white, erect; silique long (30, strictly erect; stem Ivs. 



ovate-lanceolate. (T) Can., to Pa. (Porter.) 2 3f. Glaucous. Lvs. entire. July. 



2 T. stricta Graham. Fls. rose-white, erect; silique long (30, erect, finally ascending 



or spreading ; stem Ivs. linear-lanceolate. Rocks, N. Y. (rare) to Oreg. 1 2f. May. 

 /3. br achy carp a. Fls. and siliques spreading, the latter shorter (10. Westward. 



3. IODANTHUS, T. & G. FALSE ROCKET. (loodyt, violet>colored, 

 avSo 1 *, flower.) Calyx closed, shorter than the claws of the petals. Si- 

 lique linear, terete, veinless. Seeds arranged in a single row in each cell 

 (= c ). "U Glabrous, with violet-purple flowers in panicled racemes. 

 Leaves lanceolate. 



I. hesperioides Torr & Gr. Penn. to HI. and Ark. 2 3f. Lvs. serrate or the lowei 

 pinnatifid-lyrate. Pods 15- 20", spreading. May, June. (Arabis, Gr.) 



