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, 

 scarcely toothed ; flowers small ; pods small and short 

 (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. parviflbrum Nutt. Perennial; 

 stem erect, often simple ; leaves linear- 

 obi anceolate, entire or the lowest 

 coarsely toothed ; flowers small (6 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. REpANDDM 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-hoary ; stem simple ; 

 leaves lanceolate to linear, entire or somewhat toothed ; the 

 bright orange-yellow flowers crowded ; petals 1.5-2. 5 cm. 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. Nfd. ( Waghorne) ; Mingan I., 

 Que. (Macoun)-, O. (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 E. 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. 



1. R. NASTURTIUM-AQU^TICUM (L.) Britten & Rendle. (TRUE W.) Peren- 

 nial ; steins 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. ; Nasturtium officinale R. Br. ; Roripa 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-cylin- 

 dric, or even ovoid or globular; leaves mostly 

 pinnatifid. 



* Perennial from creeping or subterranean 

 shoots ; flowers rather large, yellow. 



768. E. Nasturtium-aquaticum. 

 Leaf and part of fruiting raceme x %. 



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. (Nasturtium R. Br. ; Eoripa Bess.) Wet meadows, 

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

 from Eu.) 



