2G CEUCIFER.E. (MUSTAKD FAMILY.) 



4. LEAVENWORTHIA, Torn 



Silique oblong or oblong-linear, compressed, often contracted between the 

 seeds. Seed.s in a single row in eadi cell, orbicular, flat, winged. Embryo 

 straight or nearly so. — Small annual or biennial lierb.s, with short 1 - few- 

 Howercii steins, pinnatitid leaves, and yellow, white, or ])iir])lish (lowers, on 

 elongate<l ])edieels. 



1. L. aurea, Torr. Leaves mo.stly radical, witli 4-8ol)long tootlied l<jbes, 

 tlie terminal one larger and rounded ; raceme at length 4 - 10-(lowered ; style 

 manifest ; embryo straight. — On Hat rocks in the upper districts of Alabama, 

 and westward. — Plant 2' -6' high. Flowers yellow 



2. L. Michauxii, Torr. Leaves as in No. l ; tiowirs mostly solitary, on 

 radical peduncles ; style almost none; embryo slightly curved. (Cardamine 

 uniHora, Mic/tx.) — Kocks, Alabama and Tennessee. — Flowers purplish or 

 wliite. 



3. L. torulosa, Gray. Sili(jne linear, torose; .style fully eijualling the 

 breadth of the siliiiue ; seeds broadly oval, narrowly winged; radicle nearly 

 transverse, strictly applied to the edges of the cotyledons at the base on one 

 side ; petals purplish with a yellow base. — Cedar barrens, Tennessee {Dr. 

 Gattinger). 



4. L. stylosa, Gray. Slender, strictly steniless ; sili()ue oval or broadly 

 oblong (4" long), plane, surmounted by a slender style of fully 2 lines in 

 length ; seeds only 3-6, orbicular, distinctly winged ; embryo as iu the pre- 

 ceding ; petals pure golden yellow. — Witli the preceding. 



5. ARABIS, L. 



Silique elongated, linear, flattened; valves l-nerved,or finely veined. Seeds 

 numerous, in a single row in each cell, roundish, usually winged or margined. 

 Cotyledons accumljent. — Chiefly annual or biennial herbs. Radical leaves 

 mostly pinuatifid ; those of the stem sessile and often cordate or sagittate at 

 the base. Flowers white or rose-colored, in terminal racemes. 



* Silique compressed-filiform, erect or spreadimj ; seeds wingless or narrowli/ 



margined. 



1. A. hirsuta, Scop. Stem slender, erect, pubescent, 2" high ; leaves 

 lanceolate or oblong, cordate-clasping, smooth, sparingly denticulate, the 

 radical petioled ; petals white, twice as long as the sepals; silicpie (and pedi- 

 cel) erect, 2' long, tipped with the short style ; seed margined. — Banks of the 

 Coosa River, Georgia. May. 



2. A. patens, Sulliv. Leaves ovate, coarsely toothed ; pedicels and 

 'Sili(iues .-ipreading; style distinct. Otherwise like the last. — River banks, 

 Tennessee (Gattinger). May. 



3. A. dentata, Torr. & Gray. Pubescent and rougliish, branching from 

 the base, 1° high ; leaves ohhmg, toothed, clasping and auriculate at the base, 

 l'-2' long, the lowest obovate, petioled; petals barely exceeding the calyx; 

 silique spreading, 1' long; seed not margined. — Rich soil, Tennessee. 

 April. 



