162 



CRUCIFERAE. 



VOL. II 



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

 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 - 



1838. 

 Roripa sessiliflora A. S. Hitchcock, Spring Fl. Manha 



tan 1 8. 1894. 

 Radicula sessiliflora Greene, Leaflets i: 113. 1905 



Annual or biennial, erect, glabrous, 8'-2o' higl 

 sparingly branched above, the branches ascending 

 Leaves petioled, the lower $'-4' long, obovate c 

 oblong, obtuse, crenate, lobed or pinnatifid, wit 

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

 pods very slightly pedicelled, spreading or ascendinj 

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

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



Wet grounds, Virginia to Illinois, Iowa, Nebrask; 

 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 flower- i 

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

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

 accumbent. [Ancient Greek name.] 



A monotypic genus of the Old World. 



i. Sisymbrium Nasturtium-aquaticum L. True Water-cress. Fig. 2033. 



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



1753- 

 Nasturtium officinale R. Br. in Ait. Hort. Kew. 



Ed. 2, 4: no. 1812. 

 Roripa Nasturtium Rusby, Mem. Torr. 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, ovate or oval, or the terminal one 

 nearly orbicular; racemes elongating in fruit; 

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

 of the calyx ; pods 6"-i6" 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- 

 No v. 



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



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

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

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

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

 the plant.] 



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



