CRUCIFEKAE (MUSTARD FAMILY) 



423 



toothed or entire ; flowers small ; pods smooth, narrowly 

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

 ing or spreading pedicels. Open ground, Va. to Kan., and 

 southw. Apr. FIG. 734. Petals sometimes minute, some- 

 times none. 



5. D. nemorosa L. Leaves oblong or somewhat lanceo- 

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

 in fruit) ; petals emarginate, small ; pods elliptical-oblong, 

 735. D. nemorosa. half the length of the horizontal or widely spreading pedi- 

 Part of fruiting ceZs, pubescent or smooth. Fort Gratiot, Mich., n. Minn., 

 raceme x Vs-" northw. and westw. (Eu.) FIG. 785. 



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

 nial, leafy-stemmed, leaves finely stellate-pubescent; flowers white; style 

 definite. 



Pods pubescent. 



Style less than 1 mm. long . . 6. D. stylaris. 



Style 2-4 mm. long 7. D. ramofdssima. 



Pods glabrous 8. D. arabisans. 



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 twisted, 7-12 mm. 

 long. (Z>. 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, 



spreading; pods oval-oblong or lanceolate, strongly twisted, 

 4-10 mm. long. Cliffs, Va. to Ky., and southw. Apr.- 

 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; style about 1 mm. long. (D. incana, var. 

 arabisans Wats.) Rocky (usually calcareous) banks, Nfd. 

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

 July. FIG. 736. 



Var. orthocarpa Fernald & Knowlton. Low (1-3 dm. high) ; pods flat, 5-10 

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



Var. canadensis (Brunet) Fernald & Knowlton. Low (1-1.5 dm. high); 

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



2. BERTER6A DC. 



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

 Pubescence stellate. (Carlo Guiseppe Bertero, Piedmontese 

 botanist. ) 



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

 leaves entire, lanceolate ; pods canescent-pubescent, plump, 2.5- 

 3.5 mm. thick. (Alyssum L.) Recently introduced (with clover 

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

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



2. B. MUTABILIS (Vent.) DC. Similar; pods sparingly pubes- 

 cent or glabrate, flattish, 4.5-6 mm. broad. Roadsides and 

 cultivated ground, Mass. ; less frequent than the preceding. (Adv. 

 from Eu.) 



736. D. arabisans. 



Part of fruiting 



raceme x %. 



737. B. incana. 

 Petal x 2. 

 Pod x 2* 



