CRUCIFERAE (MUSTARD FAMILY) 



431 



761. E. cheiranthoides. 



Leaf and part of fruiting 



raceme x %. 



762. E. parviflorum. 

 Leaf and part of fruit- 

 ing raceme x %. 



1. E, cheiranthoides L. (Worm-seed Mustard.) 



Minutely roughish, branching, slender : leaves lanceolate, 

 scarcelj^ toothed ; flowers small ; ])ods small and shot 

 (1-2 cm. long), very obtusely angled, ascending on slender 

 divergent pedicels. — Banks of streams 

 or in open sterile soil. July, Aug. 

 (Eu.) Fig. 761. 



2. E. parvifl5rum Nutt. Perennial; 

 stem erect, often simple ; leaves linear- 

 oblanceolate, entire or the lowest 

 coarsely toothed ; flowers small (0 mm. 

 long):, pods narrow, 2.5-6.2 cm. long., 

 ascending on short pedicels. (E. incon- 

 spicuum MacM. ; E. syrticolum Shel- 

 don). — Ont. and Minn, -to Kan. and 

 westw. Fig. 762. 



3. E. REPANDUM L. Resembling the 

 last, but annual ; leaves repand-denticulate ; flowers 7-9 mm. 

 long; pods 4-8 cm. long, slender, divergent, on very short 

 thick pedicels. — Waste places, O. to Mo. and Kan. ; and 

 about Atlantic ports. (Adv. from Eu.) 



4. E. asperum DC. (Western Wall-flower.) Plant 

 stout, 3-6 dm. high, minutely roughish -hoarj^ ; stem simple ; 

 leaves lanceolate to linear, entire or somewhat toothed ; the 

 bright orange-yellow flowers crowded ; petals l.a-2.5c7n. long, orbicular, on very 

 slender claws ; pods nearly erect or widely spreading on short pedicels, elongated 

 (7-10 cm. long), exactly 4-sided ; stigma 2-lobed. — Xfd. ( Waghorne); Mingan I., 

 Que. {Macoun); 0. (on limestone cliffs) to Ark., S. Dak., and common westw. 

 June, July. 



23. RADICULA [Dill.] Hill. Water Cress 



Pod a short silique or a silicle, varying from slender to globular, terete 

 or nearly so ; valves strongly convex, nerveless. Seeds usually numerous, 

 small, turgid, marginless, in 2 irregular rows in each cell (except in R. sylvestris). 

 Cotyledons accumbent. — Aquatic or marsh plants, with yellow or white flowers, 

 and commonly pinnate or pinnatifid leaves, usually glabrous. (Name meaning 

 a little radish.) Roripa Scop. Nasturtium R. Br. 



§ 1. Petals white, twice the length of the calyx; pods linear ; leaves pinnate. 



\. R. Nasturtium-aquaticum (L.) Britten & Rendle. (True W.) Peren- 

 nial ; stems spreading and rooting; leaflets 3-11, roundish or oblong, nearly 



entire; pods (1.2-1.6 cm. long) ascending on 

 slender widely spreading pedicels. (Sisymbrium 

 L. ; Nastiirtiiim officinale R. Br. ; Boripa Nas- 

 turtium Rusby.) — Brooks, ditches, etc., origin- 

 ally cultivated. (Nat. from Eu.) Fig. 763. 



§ 2. Petals yellow or yellowish, seldom much 

 exceeding the calyx ; pods linear, short-cyliyi- 

 dric, or even ovoid or globular ; leaves mostly 

 pinnatifid. 



763. R. Nasturtium-aquaticum. 

 Leaf and part of fruiting raceme x %. 



* Perennial from creeping or subterranean 

 shoots ; flowers rather large, yellow. 



2. R. sylvestris (L.) Druce. (Yellow Cress.) Stems ascending ; leaves 

 pinnately parted, the divisions toothed or cut, lanceolate or linear ; pods (6-12 

 mm. long) on slender pedicels, linear and narrow, bringing the seeds into one 

 row; style very short. (Xasturtium R. Br. ; Roripa Bess.) — Wet meadows, 

 Nid. to Va., westw. to Ont., Mich., and 111. ; becoming more frequent. (Nat. 

 from Eu.) 



