484 



CBtrctFfillAE (MUSTARD iTAMILV; 



1. L. uniflbra (Miohx.) 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, (i. Micha.uxii 

 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. Toothwobt. Peppee-root 



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. 

 Kootfltock continuous, prominently toothed . . .... 



Rootstock interrupted by distinct constiictions, 

 Eootstock elongate, composed of several fusiform or subcyllndric dis- 

 tinctly toothed segments. 

 Caullne leaves with ovate or obovate petlolulate leaflets .... 



Cauline leaves with lanceolate sessile leaflets 



Rootstock of readily separable obscurely toothed fusiform tubers 

 Stem pubescent, at least above. 

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

 Leaves 3-parted, \vith linear to oblong segments . ... 5. 



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



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



1. D. diiplvytta. 



D, Tnaxinta. 

 Z>. incisi/olia. 

 2>. hetsrophylla. 



D, lacirdata. 

 D. heierophylla. 

 D. anortiala. 



1. D. diph^lla Michx. Eootstock 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. Mootstock interrupted, consist- 

 ing of several elongate strongly toothed segments which 

 are constricted at each end, the older commonly retaining 

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

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

 more or less ciliolate, sharply and coarsely toothed and 

 somewhat cleft ; flowers white or purple-tinged ; sepals 

 5-7 mm. long, half as long as the petals. — By streams 

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



3. D. incisifblia 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 petlolulate, ohlong-lanceolate to 

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

 to rhombic-obnvate naually lobed leaflets ; flowers purplish ; sepals purple-tinged, 



161. D. diphylla. 

 Cauline leaves and root- 

 stock X %. 



