CRUCIFERAE. 



[VOL. II. 



6. Lesquerella arctica (DC.) S. Wats. 

 Arctic Bladder-pod. (Fig. 1750.) 



Alyssum ? arcticum DC. Syst. 2: 324. 1821. 

 Vesicaria arctica Richards. Frank. Journ. 743. 1823. 

 Lesquerella arctica S. Wats. Proc. Am. Acad. 23: 254. 1888. 



Perennial, tufted, densely stellate-pubescent, stem 

 nearly or quite simple, erect, x'-s' tall. Leaves ob- 

 lanceolate, or spatulate, or the upper oblong, i' long or 

 less, obtuse, entire, the basal ones narrowed into broad 

 petioles, the upper sessile; petals about 2" long; pods 

 oval or subglobose, obtuse, 2 // -3 // high, glabrous or 

 somewhat stellate-pubescent, few-seeded; septum per- 

 forated; style i" or less long. 



Greenland and arctic America. Summer. 



Lesquerella irctica Piirshii S. Wats. Proc. Am. Acad. 23: 



254. 1888. 



Taller, sometimes 6' high; septum of the sparsely stel- 

 late-pubescent pod unperforatea. Anticosti. 



25. HUTCHINSIA R. Br. in Ait. Hort. Kew. Ed. 2, 4: 52. 1812. 



[HYMENOLOBUS Nutt.; T. & G. Fl. N. A. i: 117. 1838.] 



Low mostly diffuse herbs, more or less pubescent with forked hairs, our species annual, 

 with entire or pinnately lobed leaves, and very small white flowers in terminal racemes, the 

 axis of the racemes much elongating in fruit. Stamens 6. Style wanting or very short. 

 Silicles oval, obcompressed (i. f., at right angles to the partition), the valves with a strong 

 midvein. Seeds numerous in each cell; cotyledons incumbent or accumbent. [Name in 

 honor of Miss Hutchins, of Han try, Ireland, an eminent botanist.] 



About 8 species, natives of the northern hemisphere, only the following known in North 

 America. 



i. Hutchinsia procumbens (L,.) Desv. Prostrate Hutchinsia. (Fig. 1751.) 



Lepidium procumbens L. Spec. PI. 643. 1753. 

 Hutchinsia procumbens Desv. Journ. Bot. 3: 168. 1814. 

 Hymenolobus divaricalus Nutt.; T. & G. PI. N. A. i: 117. 



1838. 

 Capsella elliptica C. A. Meyer; Ledeb. Fl. Alt. 3: 199. 1831. 



Tufted, somewhat pubescent, or glabrous, branching 

 near the base, the branches ascending or procumbent, 

 slender, 2 / -6 / long. Lower leaves short-petiolcd, pin- 

 natifid, lobed, dentate or sometimes entire, %'-i f long; 

 upper leaves sessile or very nearly so, entire or lobed; 

 flowers about #" broad; pedicels very slender, ascend- 

 ing or spreading, 3 // -6 // long in fruit; pods elliptic or 

 oval, mostly obtuse or emarginate, i #"-2" long; seeds 

 several in each cell. 



In moist ground, often in saline situations, Labrador to 

 British Columbia, and widely distributed in the Pacific 

 States. Also in Europe, Asia and Australia. June-Aug. 



1780. 



26. BURSA Weber in Wigg. Prim. Fl. Hoist. 47. 



[CAPSELLA Medic. Pfl. Gatt. x: 85. 1792.] 



Annual erect herbs, pubescent with forked hairs, the basal leaves tufted. Flowers race- 

 mose, small, white. Silicles cuneate, obcordate or triangular, compressed at right angles 

 with the septum, their valves boat-shaped, keeled. Style short. Seeds numerous in each 

 cell, marginless; cotyledons accumbent. [Middle Latin, purse, from the shape of the pod.] 



About 4 species, natives of the northern hemisphere. In addition to the following, another 

 occurs in the western parts of North America. 



