crucifer^:. (mustard family.) 69 



brons in the following species, except the base of the stem and the lower or tuft of 

 radical leaves, these mostly hirsute. ) 



10. A. perfoliata, Lam. (Tower Mustard.) Tall (2° -4° high); 

 glaucous ; stem-leaves oblong or ovate-lanceolate, entire, half-clasping by the 

 sagittate base ; petals yellowish-white, little longer than the calyx ; pods very narrow 

 (3' long) and pedicles strictly erect. (Turritis glabra, L.) — Rocks and fields, 

 scarce and perhaps introduced southward; more common northward. (Eu.) 



11. A. Drummondii, Gray. Scarcely glaucous, 1° - 2° high; stem- 

 leaves lanceolate or oblong-linear and sagittate (l'-2' long) with narrow auricles, 

 or the lowest spatulate ; petals white or rose-color, fully twice the length of the calyx ; 

 pedicels and flat pods loosely erect, or ascending, or even spreading ; seeds wing- 

 margined, when mature little narrower than the partition. (Turritis stricia, 

 Graham.) — Rocky places, from the St. Lawrence in Canada East, to Lewiston 

 (Clinton), Lake Superior, and northwestward; also "Chenango Co. New 

 York," Northern Illinois, Vasey. — Pods 2^' -3^' long, or in var. (T. brachy- 

 carpa, Torr. #- Gray) only l'-2' long. 



6 . BAEBAEEA, R. Br. Winter Cress. 



Pod linear, terete or somewhat 4-sided ; the valves being keeled by a mid- 

 nerve. Seeds in a single row in each cell, marginless. Cotyledons accumbent. 

 — Mostly biennials resembling Nasturtium ; flowers yellow. (Anciently called 

 The Herb of St. Barbara.) 



1. B. vulgaris, R. Br. (Common Winter Cress. Yellow Rocket.) 

 Smooth; lower leaves lyrate, the terminal division round and usually large, the 

 lateral 1-4 pairs or rarely wanting ; upper leaves obovate, cut-toothed, or pin- 

 natifid at the base ; pods erect or slightly spreading ; or in var. stricta, ap- 

 pressed ; in var. arcuAta, ascending on spreading pedicels. — Low grounds 

 and roadsides : apparently introduced, but indigenous from L. Superior north- 

 ward and westward. (Eu.) 



2. B. precox, R. Br. (Early Winter C), with 5-8 pairs of lateral lobes 

 to the leaves, and longer pods on very thick pedicels, — yet probably only a vari- 

 ety of the other, — somewhat cultivated from New York southward as a winter 

 salad, under the name of Scurvy-Grass, — is beginning to run wild. (Eu.) 



7. ERYSIMUM, L. Treacle Mustard. 



Pod linear, 4-sided ; the valves keeled witn a strong midrib. Seeds in a sin- 

 gle row in each cell, oblong, marginless. Cotyledons (often obliquely) incum- 

 bent. Calyx erect. — Chiefly biennials, with yellow flowers ; the leaves not 

 clasping. (Name from ipvco, to draw blisters.) 



1. E. cheiranthoides, L. (Worm-seed Mustard.) Minutely rough- 

 ish, branching, slender ; leaves lanceolate, scarcely toothed ; flowers small ; pods 

 small and short (7 '-12" long), very obtusely angled, ascending on slender di- 

 vergent pedicels. — Banks of streams, New York, Penn., Illinois, and northward. 

 July. (Eu.) 



2. E. asperum, DC, var. Arkansanum, Nutt. (Western Wall- 

 flower.) Minutely roughish-hoary ; stem simple; leaves lanceolate, some- 



