434 CRUCIFERAE (MUSTARD FAMILY) 



1. L. unifldra (Michx.) Britton. Scapes 5-15 cm. high; leaf-lobes usually 

 numerous (7-15); petals purplish or nearly white with a yellowish base, obtuse ; 

 pods not torulose, oblong to linear (1.2-3 cm. long); style short. (L. Michauxii 

 Torr.) Barrens, s. Ind. to Tenn. and Mo. 



2. L. torulbsa Gray. Similar, but pods torulose even when young, linear ; 

 style 2-4 mm. long ; seeds acutely margined rather than winged ; petals emargi- 

 nate. Barrens of Ky. and Tenn. 



29. DENTARIA [Tourn.] L. TOOTHWORT. PEPPER-KOOT 



Pod lanceolate, flat. Style elongated. Seeds in one row, wingless, the funic- 

 ulus broad and flat. Cotyledons petioled, thick, very unequal, their margins 

 somewhat infolding each other. Perennials, of damp woodlands, with long 

 fleshy sometimes interrupted scaly or toothed rootstocks, of a pleasant pungent 

 taste ; stems leafless below, bearing 2 or 3 petioled compound leaves about or 

 above the middle, and terminated by a corymb or short raceme of large white 

 or purple flowers. (Name from dens, a tooth.) 



Stem glabrous. 



Kootstock continuous, prominently toothed 1. D. diphylla. 



Rootstock interrupted by distinct constrictions. 



Kootstock elongate, composed of several fusiform or subcylindric dis- 

 tinctly toothed segments. 

 Cauline leaves with ovate or obovate petiolulate leaflets . . . . 2. D. maxima. 



Cauline leaves with lanceolate sessile leaflets 8. D. ineisifolia. 



Rootstock of readily separable obscurely toothed fusiform tubers . . 4. D. heterophylla. 

 Stem pubescent, at least above. 

 Rootstock of readily separable fusiform tubers ; sepals 6-9 mm. long. 



Leaves 3-parted, with linear to oblong segments 5. D. laciniata. 



Basal leaves with ovate or rhombic leaflets 4. D. heterophylla. 



Rootstock elongate, interrupted by constrictions ; sepals 3-4 mm. long . 6. D. anomala. 



1. D. diphylla Michx. Rootstock long and continuous, often branched, the 

 annual segments slightly or not at all tapering at the ends stems in anthesis 

 1.5-3 dm. high, stoutish ; leaves 3-foliolate, the basal 

 and cauline similar, the latter 2 (rarely 3), opposite or 

 subopposite, leaflets 4-10 cm. long, short-petiolulate, 

 rhombic-ovate or oblong-ovate, coarsely crenate, the 

 teeth bluntly mucronate ; flowers white ; sepals 5-8 mm. 

 long, half the length of the petals ; pods rarely maturing. 

 Rich woods and thickets, e. Que. to s. Ont. and Minn., 

 s. to S.C. and Ky. Apr., May. Rootstocks 2-3 dm. 

 long, crisp, tasting like Water Cress. FIG. 767. 



2. D. maxima Nutt. Rootstock interrupted, consist- 

 ing of several elongate strongly toothed segments which 

 are constricted at each end, the older commonly retaining 

 shreds of old steins ; cauline leaves 2-3, alternate, often 

 remote, leaflets 2-6 cm. long, ovate or obovate, petiolulate, 

 767 D diph lla more or less ciliolate, sharply and coarsely toothed and 



Cauline leaves and r'oot- fmewhat cleft - flowers white or purple-tinged ; sepals 

 stock x V ^~^ mm. long, half as long as the petals. By streams 



in rich woods, local, s. Me. to Mich, and Pa. Apr., May. 



3. D. incisif61ia Eames. Rootstock much as in the last ; cauline leaves 2 

 and opposite, rarely 3 and alternate, the leaflets 4-9 cm. long, lanceolate, sessile, 

 glabrous throughout, coarsely incised-dentate ; basal leaves similar, with 

 broader leaflets ; flowers white or somewhat purple-tinged ; sepals 6-7 mm. 

 long; petals 1.5-2 cm. long. Rich hillside woods, Sherman, Ct. (Eames). 

 May. 



4. D. heterophylla Nutt. Tubers near the surface ; stems, in anthesis, 1.5-4 

 dm. high, glabrous or sparingly pubescent above'; cauline leaves 2-3, variously 

 disposed, the leaflets 1.5-5.5 cm. long, distinctly petiolulate, oblong-lanceolate to 

 linear, ciliate, entire to deeply crenate, rarely laciniate ; basal leaves with ovate 

 to rhombic-obovate usually lobed leaflets; flowers purplish ; sepals purple-tinged, 



