CRUCIFEU^. (mUSTAUD FAMILY.; 71 



3. B. (or SinXpis) nIgra. (Black Mustard.) Tods smooth (J' long), 

 4-conicn'(l (tlic valves only 1-ncrvcd), erect on iipprcssed pedicels forming 

 a slender raceme, tipped with a stout persistent style ; seeds dark brown, small- 

 er and more piin<::eiit than in the last; lower leaves with a lar;re terminal lobe 

 and a few small lateral ones. — Fields and w;uste places, or cultivated. (Adv. 

 from Ku.) 



13. CAMPESTKis, L., in the form of the Kutakaua and the Tlump, some- 

 times persists a year or two in neglected grounds. 



10. DRAB A, L. Whitlow-Grass. 



Pouch oval, oblong, or even linear, flat; the valves plane or slightly convex ; 

 the partition broad. Seeds several or numerous, in 2 rows in each cell, margin- 

 less. Cotyledons accumbcnt. Calyx equal. Filaments not toothed. — Low 

 herbs with entire or toothed leaves, and white or yellow flowers ; the pubes- 

 cence often stellate. (Name from bpd^rj, acrid, in allusion to the pungency of 

 the leaves.) 



§ 1. DRAB A, DC. Petals vol mfrhfd twr c!f /I. 

 * Perennial or liicnniid, le>i Jjj-stemmed : flowers white: pods twisted when ripe. 



1. D. ramosissima, Desv. Diffusdj/ much branched and forming many 

 radical tufts, perennial (.5' -8' high), pubescent; /eaves laciniate-toothed, linear- 

 lanceolate, the lower oblaneeolate ; racemes corymboscly-branehed ; jiods hairy, 

 oval-oblong or lanceolate (2" -5'' long), on slender spreading pedicels, tipped 

 with a long sti/le. — Cliffs, Harper's Ferry, Natural Bridge, &e., Virginia to Ken- 

 tucky Kiver, and southward. April, May. 



2. D. arabisans, Michx. Slightly pubescent, the perennial root bearing 

 rather numerous radical tufts; flowering stems (G'- 10' high) erect and mostli/ 

 simple; leaves oblong-lanceolate, linear, or the lower spattdate, spar inijlij toothed; 

 racemes short, usually simple; jxkIs glabious, oblong-lanceolate (S'-C long), 

 acute, on rather short and spreading pedicels, pointed with a shoii but distini-t 

 stifle. — Rocky banks, N. Vermont and New York towards the St. Lawrence, 

 also Akron, Ohio (Clinton), and shores of L. Huron and L. Superior. May, 

 June. — Petals rather large. Too near .some forms of the next. 



3. D. Inc&na, L. Ilonni-pubesccnt, biennial or somewhat perennial, the 

 radical tuft seldom branching; leaves shorter, raceme more strict, petals smaUer, 

 and pods shorter and blunter than in the last, oJ}(n pubescent, on short erect pedi- 

 cels ; style very short or none. — Dry rocks, Willoughby Mountain, Vermont, 

 Tiickerman, II. Mann.; also high northward. (En.) 



* * Annual or biennial: leaf// stems short : flowers white, or in Ao. 5 yellow: style 

 none, {flares oblong or dtoi-ate, hairy, sessile.) 



4. D. brachycarpa, Nutt. Low (2' - 4' high), minutely pubescent ; stems 

 leafy to the base of the den.sc at length elongated raceme; leaves narrowly ob- 

 long or the lowest ovate (2" -4" long), few toothed or entire; flowers small ; 

 pods smooth, mirrowly olilong, acutish (2" long), ulmtl the length of the a.imiding or 

 spreading pedicels. — Dry hills, Illinois, Kentucky, Virginia, A. II. Curtiss, and 

 southward. April. — Petals sometimes minute, sometimes none. 



