436 CRUCIFEKAE (Ml'STAUD FAMILY) 



leaflets ; stem-leaves on sagittately appendayed petioles ; terminal leaflet mostly 

 3-lobed ; pods 2.5-3 cm. long, much exceeding the pedicels. Springy places in 

 the mts. , s. Va. and southw. 



* * * Fibrous-rooted alpine perennial with simple leaves northern. 



5. C. bellidifblia L. Dwarf (2-3.6 cm. high), densely tufted; leaves ovate, 

 entire, or sometimes with a blunt lateral tooth, 2-10 mm. long, slender-petioled ; 

 flowers 1-5, white; pods 1.5-2 cm. long, upright, linear; style extremely short, 

 stout. Arctic regions and alpine districts of the n. hemisphere. Represented 

 with us by 



Var. laxa Lange. Looser and taller (4-11 cm. high) ; leaves 6-15 mm. long, 

 on very long petioles; pods 2-3 cm. long. By alpine brooks, and in cold 

 ravines, Lab. to Mt. Katahdin, Me., and Mt. Washington, N. H. ; by a brook, 

 W. Baldwin, Me. (Miss Furbish). June, July. (Greeul.) 



* * * * Boot perennial ; leaves pinnate ; flowers showy. 



6. C. pratSnsis L. (CUCKOO FLOWER.) Stem ascending from a short root- 

 stock, simple ; leaflets numerous, those of the lower leaves rounded and stalked, 

 of the upper oblong or linear, entire, or slightly angle-toothed ; petals (white 

 or rose-color) thrice the length of the calyx ; pod 2-3 cm. long, 2 mm. broad ; 

 style short. Wet places and bogs, Lab. to Vt., N. J., Minn., and north w. ; 

 rare. May. Also introduced or a local escape in e. and s. N. E. (Eu.) 



* * * * # Root mostly biennial or annual,' leaves pinnately 6-ll-/0Wolate; 

 flowers small, white. 



*- Stamens 4; leaflets strigose-hispid upon the upper surface. 



7. C. hirsuta L. Leaves chiefly radical, with short and broad leaflets, but 

 those on the erect stem reduced and with narrow leaflets ; pods erect, on 

 ascending or appressed pedicels. Moist places, s. Pa. to N. C., and "Mich." 

 (Eu.) Perhaps introduced. A doubtful specimen from w. Mass. (Miss Vail). 



1- -- Stamens normally 6; leaflets glabrous; stem leafy. 



8. C. parvifl6ra L. Very slender, subsimple, glabrous or slightly pubescent 

 upon the stein ; leaflets of the radical leaves oval or the terminal suborbicular ; 

 those of the cauline very narrow, linear, not confluent ; pods erect, on ascending 

 pedicels. (C. hirsuta, var. sylvatica of some Am. auth.) Rocky and barren 

 soil, Me. to Ga. and westw. (Eu.) A form more branched from the base and 

 with leaflets all narrow and often toothed has been described as C. arenicola 

 Britton, growing in sandy soil in the Atlantic States but lacking constant 

 characters. 



9. C. pennsylvanica Mulil. Larger, nearly or quite glabrous ; leaflets 7-11, 

 the terminal one obovate, the lateral oblong, tending to be confluent along the 

 rhachis ; pods erect, on ascending pedicels. (C. hirsuta Man. ed. (>, in givnt 

 p ar t.) Moist ground, common. Passes imperceptibly into a form (C. flexuosa 

 Britton, perhaps Withering) with fewer more flabelliforin leaflets and spreading 

 pods. Brooks, etc. 



31. ARABIS L. ROCK CRESS 



Pod linear, flattened ; placentae not thickened ; the valves plane or convex, 

 more or less 1-nerved in the middle, or longitudinally veiny. Seeds margin- 

 less or winged. Cotyledons accumbent or a little oblique. Leaves seldom 

 divided. Flowers white or purple (rarely yellowish). (Name from the 

 country, Arabia.) 



1. SISYMBRlNA Wats. Seeds oblong or <///>//////. >-,/// *>/?,///, >rin</lrs*, in 

 one row ; <'<>tt//i <!<nix nftcn more or less oblique; />i<>)/i<tl or perennial, 



bran chin 1 1 from 



1. A. lyrata L. Mostly glabrous, except tin- hji-<it<--i>inn<it(iiii root-leaves; 

 stem-leaves scattered, spatulate or linear with a tapering base, sparingly toothed 



