28 CRUcrrauE. 



1. saxatilis. Rock Candy-tuft. 

 Shrubby: hairs linear, entire, somewhat fleshy, rather acute, smooth or ciliate 

 Flowers white, in corymbs. Stems nearly 1 foot high. April— June. Native of 

 Booth Europe. 



10. ISATIS. Linn. 



Silicle elliptical, fiat, 1-celled, 1 -seeded, with boat-shaped 

 valves, which are scarcely dehiscent. 

 1. I. tikctobia, L. Woad. 



Silkies wedge-form, acuminate at the base, somewhat spatnlate at the end, 



very obtuse, 3 times as long as broad. Native of England ; eultivat d for the 



sake' of its leaves, which yield a dye that is substituted for indigo. 3Iav — July. 



Stem 4 feet high. Leave* large, broad, clasping the stem. Uow. largt, 



inal racemes. 



Section 2. SILIQUOSJE. Pod mostly long and narrow. 

 11. DEXTAEIA. Linn. Tooth-wort. 



Lai. dens, a tocth: on account of the tooth-like scales of the root. 



Sepals converging. Silique (pod) narrow-lanceolate* 

 with a long tapering style : valves fiat, nerveless, revolute, 

 opening elastic-ally : pJacentee not winged. Seeds in a single 

 row, not margined: funiculus slender. — Herbaceous plant* 

 u-ith roots, divided leaves, and white or purplish 



/hicers. 



1. D. laciniata, Muhl. Common Tootliwort. 



Stem leaves 3, verticillate, on short petioles, ternate: leaflets 3-parted segments 

 linear, entire, coarsely toothed or piunatind: lateral ones lobed: roct moniliform, 



Woods and rocky places near streams. April and Hay. Stem 6 to 12 inches 

 high, simple. Leave* usually in a whorl about half-way op. Fl< vers in 

 terminal racemes, pale, rose-colored, or white. Fetals cuneate-ol ovate, attenuated 

 below. Forf about 1 iuch long. Foot consisting of a chain of C or 4 nearly tocih- 

 less-oblong tubers, of a pungent taste. 



2. D. diphylla, Mich. Pepper Root. 



Stem lea res mostly 2, on short petioles, ternate: leaflets ovate oblong, unequally 

 and coarsely toothed or laciniate. 



Woods and wet meadows. May. Stem 6 tol2 inches high. Leave* large, opposite 

 or nearly so, above the middle of the stem. Fl L, large white, the 



petals much larger than the calyx. Foot-stock large, beset with teeth, with a 

 pungent, aromatic taste. Fod about an inch long. 



3. I), maxima, Nntt. Great Toothwort. 



Leaves 2 to 7. alternate, on long petioles, ternate: leaflets ovate, obtuse, coarsely 

 toothed and incised, often 2 to 3 cleft ; lateral ones lobed ; axils naked ; raceme* 

 lateral and terminal. 



Woods; rare. June. Stan often nearly 2 feet high. Flowers in racemes, pale 

 purple. Foot-stock a string of strongly toothed tubers. 



