CRUCrFERJE. 



45 HESPERIS. 



inches high, branching. Leaves clasping the stem, with their arrow-shaped 

 bases, the margin nearly entire, tapering to a point. This plant is cultivated 

 in Europe for "the seeds, from which an oil is expressed. Flowers yellow. 

 June. Ann. Madwort. False-jiax. 



18. CAPSE'LLA. 

 Silicle triangular, cuneiform; valves boat-shaped, wingless, 

 coriaceous; cells small, many-seeded ; cotyledons incumbent. 



Name, a diminutive of cajisuh, on account of the little, inversely-heart- 

 shaped silicles. A genus removed from Thlaspi on account of its incumbent 

 cotyledons. 



C. BURS.\-PASTo'ris. Dc. Thlaspi bursa-pastoris. L. 



Plant hairy; silicle triangular, obcordate, wingless; cells many-seeded; 

 radical leaves pinnatifid. The Shepherd's Purse is found every where in 

 pastures and by road sides, flowering from INIarch toOct. Stem round, branch- 

 ing, from a few inches to a foot high. Root leaves rosulate, hairy, more or 

 le^s pinnatifid and toothed. Stem leaves much smaller, auriculate at base, 

 sessile. Flowers small, white, in racemes which continue to ascend and put 

 forth new blossoms until the late frosts of Autumn. Silicles smooth, triangu- 

 lar, emarginate at the end, and tipped with the style. Ann. Shepherd's Purse. 



19. SUBULA'RIA. 

 Silicle oval; valves turgid ; cells many-seeded; stigma ses- 

 sile; cotyledons linear, curved. 



Named in reference to the linear-subulate leaves. A small aquatic plant. 



S. aqua'tica. 



The only species. . Grows on the muddy shores of ponds, in Maine. Autt. 

 Leaves all radical, an inch in length, awl-sliaped. Scape two or three mches 

 high, racemose, with a few minute, white flowers, on slender pedicels one or 

 two lines in length. Jiwlwort. 



20. HE'SPERIS. 

 Calyx closed, furrowed at base, shorter than the claws of the 

 petals; petals bent obliquely, linear or obovate ; silique 4- 

 sided, 2-edged or subterete ; seeds not margined ; sligm.as 

 forked, with the apices converging. 



Gr. io-TTiQvi, the eyening; the flower is more fragrant towards evening. 



1. H. matriona'lis. 



Stnn simple, erect ; leaves lanceolate, ovate, denticulate ; petals emarginate, 

 mucronate; pedicels as long as the calyx. A fine garden perennial, said to be 

 found native about Lake Huron. Stem 3 or 4 feet high. Flowers purple; 

 often double and white in /3, hortensis. Roclf-ct. 



2. H. apri'ca. 



Stem simple, erect, pubescent; leaves oblong, obtuse, entire, ciliate-hispid ; 

 pedicels as long as calvx. From Siberia. Stem a fpot high. Flowefs pur- 

 ple. Mav, June. Per. Siberian Rocket. 



