CRUCIFERAE (MUSTARD FAMILY) 



423 



735. D. nemorosa. 



Part of fruiting 



raceme X 2/3. 



toothed or entire; flowers small; pods smooth, narrowly 

 oblong, acutish (4 mm. long), about the length of the ascend- 

 ing or spreading pedicels. —{)\)en ground, Va. to Kan., ami 

 southw. Apr. Fig. 734. — I'etals sometimes minute, some- 

 times none. 



5. D. nemorbsa L. Leaves ohlong or somewhat lanceo- 

 late, more or less toothed; racemes elongated (1-2 dm. long 

 in fruit) ; petals emarginate, small ; pods elliptical-ohh,ng, 

 half the length of the horizontal or icidely spreading pedi- 

 cels, pubescent or smooth. — Fort Gratiot, Mich., n. Minn., 

 northw. and westw. (Eu.) Fig. 7o5. 



§ 3. DRABAEA Lindblom. Petals not notched or cleft; perennial or bien- 

 nial, leafystemifiied, leaves finely stellate-pubescent; flowers white; style 



Pods pubescent. 

 Style less than 1 mm. lODg 

 Style 2-4 ram. long . « 



Pods glabrous 



6. D. stylarig. 



7. D. rumoKifmima. 



8. Z>. arabUana. 



6. D. stylaris J. Gay. Caudex simple or branching ; flowering stems simple 

 or slightly branched, pilose, 0.5-3.5 dm. high, remotely leafy ; basal rosettes with 

 oblanceolate entire or remotely dentate canescent leaves (1-4 cm. long), the 

 cauline leaves ovate to oblong, usually dentate ; racemes loose ; pedicels short, 

 ascending ; pods narrowly oblong to lanceolate, sometimes twi.sted, 7-12 mm. 

 long. (i>. incana Man. ed. 6, not L.) — Dry calcareous cliffs and ledges, 

 locally from Lab. to N. B. and n. Vt.; Rocky Mts. May, June. (Eurasia.) 



7. D. ramosissima Desv. Darker green, less pubescent; leaves laciniate- 

 toothed ; racemes corymbosely-branched ; pedicels elongate. 



or lanr-eolate, strongly twisted, 

 to Ky., and southw. Apr.- 



spreading ; pods oval-oblon 

 4-10 mm. long. — Cliffs, V 

 June. 



8. D. arabisans Michx. Caudex usually much-branched, 

 the flowering stems simple or slightly branched, 1.5-4.5 dm. 

 high, sparingly pubescent; basal leaves oblanceolate or spatu- 

 late, entire or somewhat dentate, thin, green, sparingly stel- 

 late, 1-7 cm. long, cauline scattered, serrate-dentate ; racemes 

 loose ; pedicels divergent ; pods elliptic-lanceolate, much twisted, 

 9-15 mm. long; stymie about 1 mm. long. (D. incana, var. 

 arabisans Wats.) — Rocky (usually calcareotts) banks, Nfd. 

 to Ont., locally s. to Me., Vt., and n. and w. N. Y. May- 

 July. Fig. 736. 



Var. orthocdrpa Fernald & Knowlton. Low (1-3 dm. high) 

 mm. long. — Lab. to N. B. and n. Vt. 



Var. canadensis (Brunet) Fernald & Knowlton. Low (1 



pods elliptic-ovate to suborbicular, 5-7 mm. long. — St. Joachim, Que. 



73G. D. arabisans. 



Part of fruiting 



raceme x %. 



pods flat, 5-10 

 -1.5 dm. high); 



737. B. incana. 

 Petal X 2. 

 Pod X 2. 



2. berter6a DC. 



Pod elliptic ; seeds several, ringed. Petals white, 2-parted. 

 Pubescence stellate. {Carlo Guiseppe Bertcro, Piedmontese 

 botanist. ) 



1. B. incXna (L.) DC. Pale green, 3-6 dm. high, branched ; 

 leaves entire, lanceolate; pods canescent-pnbesrent, plump, i.'.5- 

 3.5 m7n. thick. (Alyssum L.) — Recently introduced (with cIovit 

 seed?), becoming common in N. E. ; occasional in other Atlantic 

 States, and extending inland. (Nat. from Eu.) Fig. 737. 



2. B. wdtAbilis (Vent.) DC. Similar; pods sparingly ptihrs- 

 cent or glabrate, flattish, 4.6-6 mm. broad. — Roadsides and 

 cultivated ground, Mass.; less frequent than the preceding. (Ad\: 

 from Eu.) 



