OP THE WASATCH REGION 35 



10. RADICULA. (Nasturtium; Roripa.) Cress. 



Herbs growing in water or at least in wet places. Leaves 

 varying from toothed to pinnately-divided. Flowers small; 

 white or yellow. Silique oblong 1 , with seeds in 2 rows in each 

 cell. 



Perennial growing" in running water; 



petals white 1. R. Nasturtium-Aquaticum 



Biennial growing near wa.ter; petals yellow 2. R. pacifioa 



1. R. Nasturtium- Aqunticiim (L.) Britton & Rendle. (Nas- 

 turtium officinale R. Br. ; Roripa Nasturtium (L.) Rusby.) 

 True "Water Cress. Stems ascending and rooting at the nodes; 

 glabrous; sometimes 2-3 ft. high. Leaves with 3-11 roundish 

 or elliptical segments. Petals twice the length of sepals. 

 Around cold springs and in irrigation ditches. Introduced. 

 May-October. 



2. R. rmcifica (Howell). (N. terrestre occidentale S. "Wats.: 

 Roripa clavata Rydb.) Stems erect, about a foot high; gla- 

 brous. Leaves lyrate. glabrous, or the auricles ciliate. Style 

 short and thick. Siliques stout, %-% inch long; sometimes 

 4-carpellary. Seeds tuberculate. In wet places. May-June. 



11. SISYMBRITJW. (Includes Sophia and Stenophragma.) 

 Annuals, biennials or perennials with spreading pubescence. 

 Flowers small; yellow or rarely white. Silique terete, flat- 

 tened or 6-sided. Seeds without margins; in 1 or 2 rows in 

 each cell. t 



Flowers yellow. 



Pubescence of simple hairs; leaves not com- 

 pound 1. S. officlnnle 



Pubescence of forked or stellate hairs; leaves pin- 



nately -compound. 



Silique narrowly linear: %-l inch long.... 2. S. Sophia 

 Silique linear-oblong. y s -% inch long. 



Densely canescent: pedicels diverging nearly 



90 degrees from stem 3. S. piniiatuin 



Glabrate or sparsely canescent; pedicels less 



widely divergent 4. S. tneisuin 



Flowers white 5. S. Thaliaimm 



1. S. officinale (L.) Scop. Hedge Mustard. Stem sparingly 

 branched if at all. Leaves rnncinate. Siliques thick -walled; 

 pubescent, closely appressed: borne on a very short pedicel. 

 Stigma 2-lobed. A homely weed of waste places. May-Nov. 



2. S. Sophia L. A bushy, minutely hoary-pubescent annual. 

 Stems slender, 1-2% ft. high. Leaves 2-3 pinnatifid. the ulti- 

 mate segments linear or linear-oblong. Pedicels very slender, 

 ascending, shorter than silique. Seeds in 1 row in each cell. 

 Dry ground in waste places. June-August. 



3. S. pinnatiim (Walt.) (Sophia pinnata (Walt.) Brit.: S. 

 canesrens Nutt."> Tansy Mustard. Stem erect a.nd slender: 

 branched; 6-24 inches high. Leaves 1-3 pinnatifid into many 

 obtuse segments. Flowers very small; ascending, on very 

 slender pedicels. Style very short; stigma simple. Siliques 

 ascending or nearly horizontal: longer or shorter than pedicels. 

 Seeds in 2 rows in each cell. A homely weed of waste places 

 and dry plains. Ma.y-September, 



