'54 



CRUCIFERAE. 



Vol. II. 



nearly entire. Seeds i or 2 in each cell of the pod, wingless; cotyledons accumbent. [Greek, 

 curing madness.] 



A genus of 100 species or more, natives of the Old World, some 

 of them known as Madwort. Type species: Alyssum inontamtm L. 



I. Alyssum alyssoides L. Yellow or Small Alyssum. 

 Fig. 2012. 



Clypeola alyssoides L. Sp. PI. 652. 1753. 

 Alyssum alyssoides L. Syst. Ed. 10, 1130. 1759. 



Alyssum calycinum L. Sp. PI. Ed. 2, 908. 1763. 



Annual, densely erect, simple, or branching from the base, 

 tufted, 3'-io' high. Leaves linear-oblong or spatulate, nar- 

 rowed at the base, obtuse, entire, 3"-is" long, the lower some- 

 what petioled; flowers yellowish-white, i" broad; pedicels 

 spreading or ascending, 2" long in fruit; pods orbicular, li" 

 in diameter, margined, minutely pubescent, notched at the 

 apex, tipped with the minute style ; sepals persistent around 

 the base of the pod; seeds 2 in each cell; style minute; fila- 

 ments of the shorter stamens minutely toothed at the base. 



In fields, Ontario to Massachusetts, southeastern New York, 

 New Jersey and Iowa, and in ballast about the seaports. Also in 

 the Far West. Naturalized or adventive from Europe. Heal-bite. 

 Heal-dog. Summer. 



5. LESQUERELLA S. Wats. Proc. Am. Acad. 23 : 249. 1888. 



Low annual or perennial herbs, with stellate pubescence, simple leaves, and racemose 

 mainly yellow flowers. Petals entire. Anthers sagittate. Pod generally inflated, globose 

 or oblong; valves nerveless; septum translucent, nerved from the apex to the middle. Seeds 

 several or many in each cell of the pod, flattened, marginless or narrow-margined ; cotyledons 

 accumbent. [Dedicated to Leo Lesquereux, 1805-1889, Swiss and American botanist.] 



A genus of about 35 species, natives of America, and mainly of the western parts of the United 

 States. Type species : Lesquerella Lescurii (A. Gray) S. Wats. 



Pods stellate-pubescent. 



Pods ob'ong, acute, 2" long; low perennial. i. L.spathulata. 



Pods glubose, 1" in diameter; tall annual or biennial. 2. L. globosa. 



Pods oval or subglobose. 2" long ; tall biennial or perennial. 3. L. argentea. 



Pods glabrous or very nearly so. 



Annual, sparingly pubescent; stem slender, i°-2° tall, much branched; southwestern. 



4. L. gracilis. 



Perennial, densely stellate ; stem rather stout, 6'-i2' tall, simple ; western. 5. L. ovalifolia. 



Perennial, i'-6' tall; stem simple; arctic. ' 6. L. arctica. 



I. Lesquerella spathulata R^dberg. Low Bladder-pod. 

 Fig. 2013. 



Lesquerella spathulata Rydberg, Contr. U. S. Nat. Herb, 3 ; 486. 1896, 



Perennial, tufted from a deep root, very finely canescent and 

 stellate, 4-5' high; stems slender, generally numerous, simple. 

 Lower leaves oblanceolate or spatulate, 6"-i2" long, acutish, 

 narrowed into a petiole; the upper linear, mainly less than i" 

 wide; flowers yellow, about 2" broad; racemes rather few-flow- 

 ered ; pedicels 3"-6" long, ascending, or recurved in fruit ; pods 

 oblong or nearly globose, slightly compressed, acute, subacute 

 or rarely obtuse at each end, finely canescent, about 2" long, 

 few-seeded, tipped with a style of about their own length; 

 septum commonly unperforated. 



Dry hills. Nebraska and South Dakota to Montana and the North- 

 west Territory. June. 



