40 



Ull UCl FER.-E. Ihassica. 



3. B. Sinapistrum, r.oiss. Annual, rough with spreading liairs, 2 to 5 feet 

 liigh : lower k'uvus usiuiliy with a largo coarsely toothed terminal lohe and a few 

 smaller ones upoji the rliarliis; the upj^ir leavi-s often undivided, oblong or lanceo- 

 late : pods somewhat torulose, 1 to U inclu-a long, more than a thinl occupied by 

 the stout 2-edged beak; valviis often ribbiul by the prominent nerves. — SiHaj>is 

 (trvt/tsiii, Linn. 



The (Jhurlock of tliu Eaatfiu SUitcs anil Europe, where it is olteii a troublesome weuil in grain- 

 fields. Sparingly naturalizeil in Southern Caliloinia. 



14. BARBAREA, U. IJrowu. Winteu Chk.ss. 



Pod linear, somewhat ilattened, pointed ; valves somewhat carinate. Seeds in 



one row, oblong, turgid, ujarginless ; cotyledons slightly obli(]ue. Petals yellow.- — 



Glabrous erect branching biennials or perennials, with angled stems and entire or 



pinnatitid leaves. 



A small genus of temperate regions, some of the species widely distributed. The only one 

 native to Ameiiea is the following. 



1. B. vulgaris, Ik. iJr. Perennial, 1 to 3 feet high : lower leaves lyrate-pin- 

 natitid (the radical pinnate), with a largo rounded terminal lobo and 1 to 5 pairs of 

 lateral ones, oblong in the canlino leaves ; ui)por leaves obovato, more or les.s pin- 

 natilid at buso : llowers 2 to 3 lines long : anthers short, oblong : pods erect, often 

 uppressed, 1 to 1^ inidies long, Honiewliut angled when mature, about 25-8eoded, 

 beaked with the rather slender style. — (jray, Cien. 111. i. 148, t. G2. 



Var. arcuata, ICoch. Pods and pedicels spreading. 



Inhabiting marshes and damp places. Only the variety seems to have been collected in Cali- 

 fornia, near San Francisco and northward to Sitka, though the typical form is common in Oregon 

 and eastward ; the species ranges neaily round the world. 



15. SISYMBRIUM, l.inm Hedge Mustakd. 



Pod linear, terete or nearly so, short-pointed or obtuse ; valves somewhat 1-3- 

 nerved. Seeds usually in one row, small, oblong and teretish, not margined ; coty- 

 ledons incumbent. Sepals scarcely gibbous at base. Petals yellow or yellowish. 

 Anthers mostly linear-oblong, sagittate. — Erect herbs, with small flowers, the 

 leaves (in our species) not clasping or auriculate at base, rarely entire, often tinely 

 dissected. 



A largo genus of rather tlillicult defniifion. nrlncipally conlinod to the northern temperate zone. 

 The American species, less than a dozen, belong to the region west of the Mississippi, ^S". canen- 

 cens alone ranging farther eastward. 



* Seeds ill tivo rows : leaves usualli/ finely dissected. 



1. S. canescens, Nutt. Annual, canescent with short branching hairs: stems 

 branched, i to 2i feet high : leaves 1 - 2-pinnate, the segments more or less deeply 

 pinnatifid "or toothed : petals light yellow, equalling the sepals, usually a line 

 long or less : pods oblong to linear, 3 to G lines long, a lino broad or less, acuto 

 at each end and beaked with the very short style, shorter than the slender spread- 

 ing pedicels: seeds ovate-oblong, a third of a line long. — Oray, Gen. 111. i. 102, 

 t. G't ; rounder, Sisymb. Go ; Watson, Dot. King Exp. 23. 



In dry soils from Monterey southward, and very abundant in the valleys on the eastern side of 

 the Sierra Nevada, where its seeds are collected by the Indians. The species ranges in the interior 

 from the Arctic Circle to Mexico, and as far eastward as New York and Pennsylvania. The aS'. 

 brachycarpuDt. cited by Fouinier as from San Diego is probably but a form of this, as is certainly 

 the northern plant so named by Richardson. The species is (^uite vaiiable, esiiecially in the 

 section of the leaves and length of the pod. 



