63 CRuciFF.u^. (mustard family.) 



pods icidchj sprendincj, rerji slender, short-stalked ; sti/le scarcely ant/; seeds niar£rin- 

 less. — New York and Illinois to Virjjinia and Kentucky. May, June. 

 * * Erect and sim/tle lea/'ij-stemmed hieniiials, tvith white or whitish Jlowers, nairow 

 but flattened ascending or erect pods, and wingless seeds. 



5. A. patens, Sulliv. Downy with spreading hairs, ercet (1°- 2° hifrh) ; 

 stem-leaves oblong-ovate, acutish, coai*sely toothed or the uppermost entire, 

 partly elasi)ing hy the heart-shaped base ; petals (bright white, 4" long) twice 

 the length of the calyx ; pedicels slender, spreading ; pods spreading or uscmding, 

 tipjted with a distinct sfi/le. — Central Ohio (rocky l)anks of the Scioto, Sulli- 

 vant), Pennsylvania (Huntingdon Co. to the Schuylkill, Porter) ; also in E. 

 Tennessee. April, May. 



6. A. hirstlta, Scop. Rough-hairy, sometimes smoothish, strictly erect 

 (\°-2° high) ; stem-leaves oblong or lanceolate, entire or toothed, partly clasp- 

 ing by a somewhat arrow-shaped or heart-shaped base ; petals (greenish-white) 

 small, but longer than the calyx ; pedicels and pods stricthj upright ; style scarcely 

 any. — Rocks, common, especially northward. May, June. (Eu.) 



» * * Erect and simple leafy-stemmed biennials (l°-3° /(/////), with small whitish 

 flowers, recurved-spreading or pendulous flat pods (.3' -4' long), and broadly 

 winged seeds, their stalks adherent to the partition. 



7. A. laevigata, DC. Smooth and glaucous, upright ; stem-leaves partly 

 clasjiing by the arrow-shaped base, lanceolate or linear, sparingly cut-toothed or 

 entire ; petals scarcely longer than the calyx ; pods long and narrow, recurved- 

 spreading on ascending or merely spreading pedicels. (This is also A. hetero- 

 phylla, Nutl.) — Rocky places, Maine to Wisconsin and Kentucky. May. 



8. A. Canadensis, L. (Su kle-pod.) Stem upright, smooth above; 

 stem-leaves pubescent, jioiutid at both ends, oblong-lanceolate, sessile, the lower 

 toothed ; petals twice the length of the calyx, oblong-linear ; pods very flat, 

 scythe-shaped, hanging on rough-hairy pedicels (2" wide). — (A. falcata, Michx.) 

 Woods and ravines ; not rare, especially westward. June- Aug. 



« * * * Tall and kafy-stemmed biennials or pei-ennials, with rather shoivy flowers, 

 the pink-purple petals long-clawed ; anthers sagittate and ivlien old arcuate- 

 recurved; the ividely spreading and rather short jiods marly terete ; seeds mar- 

 ginless. (Iodantiics, Torr. .j- G'ra_y.) — Transition to Thclypodium and 

 Streptanthus. 



9. A. hesperidoides. Glabrous (10-3° high), often branched above; 

 root-leaves round or heart-shaped, on slender petioles ; stem-leaves ovate-ob- 

 long and ovate-lanccolatc (2' -6' long), membranaceous, veiny, sharply and 

 often doubly toothed, tapering to each end, the lower into a winged petiole, 

 sometimes bearing a pair or two of small lateral lobes ; pods on short diverging 

 pedicels, pointed by a short style. (Ilesperis pinnatifida, .l/a/ijr. lodanthus 

 hesperidoides, Torr. <$• 6Vo^.) — Alluvial river-banks, Ohio, Kentucky and 

 Bouthwestward. May, June. 



§ 2. TURRITIS, Dill. Seed^i not so broad as the partition, occupying two more or 

 le-is distinct rows in each cell, at leiist when young : s/rirt and nry b ofy-stemmal 

 biennials ; the cauline leaves partly clasping by a sagittate base. ( Very gla- 



