CEUCIFERAE 101 



Pods 3'^-9'^ long, mauy-seeded. 



Leaves entire. ^ ^ ^ ,. . 



Pods smooth. 1- D. Carolimana. 



Pods hispid. 2. D. micrantha. 



Leaves toothed. 3. D. cuneifoha. 



Pods V^-2" long, few-seeded. 4. D. brachyearpa. 



1. D. CaroUniana Walt. 1^-6^ high, much branching and spreading : 

 leaves oblong-oval, \'^-W long : pods linear, longer than the pedicels.— 

 In sandy fields near Independence and Courtney. April-May. 



2. D. micrantha Nutt. Resembles the last but is larger throughout, 

 and the hispid pods are wider.— Common in barrens. April-May. 



3. D. cuneifolia Nutt. Resembles No. 1, but leaves are cuneate at 

 base, and sparingly dentate above : pods minutely hairy.— Common in a 

 barren east of Dodson. April-May. 



4. D. brachyearpa Nutt. V-A^ high: leaves ovate, entire: pods smooth, 

 oblong.— Wet, sterile prairies, from Little Blue Tank to Greenwood. Rare 

 and local. April. 



14. SOPHIA Adans. Tansy Mustard. 



Herbs with twice-pinnatifid leaves and forked pubescence. Pods linear, 



long-pedicelled, seeds in 1-2 rows in each cell. Cotyledons incumbent. 



Pedicels ascending. 1- -5. intermedia. 



Pedicels horizontal. 2. S. mynophylla. 



1. S. intermedia Rydb. W-2A^ high, glabrous or short-glandular- 

 pubescent : leaves twice pinnate : pods erect, i'^-T' long.— Often common 

 in dry grounds and waste places throughout. April-July. 



2. S. myriophylla (DC.) Rydb. Resembles the last, of which it may 

 be but a form, but has horizontal pedicels and pods, the latter 5^^ or less 

 long.— Dry grounds west of Lee's Summit and probably common. April- 

 July. 



, 15. ARABIS L. Rock Cress. 



Pods linear, the valves 1-nerved. Seeds in one row in each cell in 

 ours. Cotyledons accumbent. 



Leaves pinnatifid. 1- ^- Virginica. 



Leaves merely dentate. 



Stem leaves clasping. 2. A. dentain. 



Stem leaves not clasping. 3. A. Canadensis. 



1. A. Virginica (L.) Trelease. 6^-14^ high, diffusely spreading : pods 

 ascending, about V long, on short pedicels.— Very common along the 

 railroad from Pixley's Switch to Buckner, and in wet sandy fields near 

 Grain Valley. Probably native. April-May. 



2. A. dentata T. & G. l°-2° high, ascending : leaves oblong, unequally 

 toothed : pods spreading, very slender, W-\5'' long.— In wet woods and 

 on wet rocks throughout, but not common. 



3. A. Canadensis L. l°-3° high, erect, pubescent below : leaves lan- 

 ceolate-oblong : pods pendulous, scythe-shaped, 2^-4' long.— Occasional 

 in rocky woodlands tbroughout. May-June. 



