l62 



CRUCIFERAE. 



Vol. II. 



Radicula curvisiliqua (Hook.) Greene, admitted into our first edition as reported from Ne- 

 braska is here omitted ; it is not definitely known to range east of Wyoming. 



7. Radicula sessiliflora (Nutt.) Greene. 

 Sessile-flowered Cress. Fig. 2032. 



Nasturtium sessiliflorum Nutt.; T. & G. Fl. N. A. i : 73. 

 1838. 



Roripa sessiliflora A. S. Hitchcock, Spring Fl. Manhat- 

 tan 18. 1894. 



Radicula sessiliflora Greene, Leaflets i: 113. 1905. 



Annual or biennial, erect, glabrous, 8-20' high, 

 sparingly branched above, the branches ascending. 

 Leaves petioled, the lower 3'-4' long, obovate or 

 oblong, obtuse, crenate, lobed or pinnatifid, with 

 obtuse lobes; flowers yellow, i" broad, nearly sessile; 

 pods very slightly pedicelled, spreading or ascending, 

 3"-6" long, i" broad, narrowly oblong; style very 

 short ; seeds minute, mostly in 2 rows in each cell. 



Wet grounds. Virginia to Illinois, Iowa, Nebraska, 

 Arkansas, Florida and Texas. April-June. 



13. SISYMBRIUM [Tourn.] L. Sp. PI. 657. 1753. 



An aquatic or uliginous herb, with pinnately divided leaves, and small white flowers in 

 terminal racemes. Pods linear to linear-oblong, slender-pedicelled, tipped with the rather 

 stout style, the valves nerveless. Seeds in 2 rows in each cell of the pod. Cotyledons 

 accurabent. [Ancient Greek name.] 



.\ monotypic genus of the Old World. 



I. Sisymbrium Nasturtium-aquaticum L. True Water-cress, Fig. 2033. 



Sisymbrium Nasturtium-aquaticum L. Sp. PI. 657. 



1753. 

 A astnrtium officinale R. Br. in Ait. Hort. Kew. 



Ed. 2, 4 ; 1 10. 1812. 

 Roripa Nasturtium Rusby, Mem. Torn Club 3: 



Part 3, 5. 1893. 

 Radicula Nasturtium-aquaticum Britten & Rendle, 



Brit. Seed Plants 3. 1907. 



Glabrous, branching, floating or creeping, 

 rooting from the nodes. Leaves of 3-9 seg- 

 ments, the terminal one larger than the lateral, 

 all obtuse, ovaje or oval, or the terminal one 

 nearly orbicular ; racemes elongating in fruit ; 

 flowers 2"-2i" broad ; petals twice the length 

 of the calyx ; pods 6"-l6" long, i" wide, 

 spreading and slightly curved upward, on pedi- 

 cels of about their length ; seeds distinctly in 

 2 rows. 



In brooks and streams, Nova Scotia to Mani- 

 toba, Virginia, Missouri, Arizona and California. 

 Common in most districts. Naturalized from Eu- 

 rope. Native also of northern Asia and intro- 

 duced into the West Indies and South America. 

 Widely cultivated for salad. Well- or water- 

 grass. Crashes. Brook-lime. Brown-cress. April- 

 Nov. 



14. ARMORACIA Gaertn. Meyer & Schreb. Fl. Wett. 2 : 426. 1800. 



Tall perennial glabrous herbs, with large pungent roots, leafy flowering stems and rather 

 large white flowers in terminal racemes, the pedicels slender. Silicles short, little, if any, 

 longer than wide. Style short ; stigma subcapitate. Seeds few, in 2 rows in each cell. 

 Cotyledons accumbent. [Name from the Celtic, referring to the favorite (saline) habitat of 

 the plant.] 



A genus of a few species, natives of Europe and Asia, the following typical. 



