CRUCIFER^E. (MUSTARD FAMILY.) 25 



ascending on stout pedicels, soon recurved, shorter than the long subulate 

 style. — Proc. Am. Acad. xii. 54. S. W. Colorado on the San Juan, etc., 

 Brandegee. 



14. VESICARIA, 1 Tourn. Bladder-pod. 



Low densely stellate-canescent herbs, with large yellow flowers, entire or 

 sinuately toothed leaves, and long slender styles. 



* Pod smooth. 



1. V. Fendleri, Gray. Low, spreading from a thick woody caudex : 

 leaves linear or linear-spatulate, crowded, mostly entire : raceme densely 

 many-flowered : pod membranaceous. — PI. Feudl. 9. V. stenophylla, Gray, of 

 Fl. Colorado, 6. Southern Colorado and southward. 



* * Pod hairy. 



2. V. Ludoviciana, DC. Stem simple or somewhat branched above : 

 radical leaves spatulate, entire; cauline linear : pod obovate, globose, a little longer 

 than the style. — Colorado and Wyoming. 



3. V. montana, Gray. Stems spreading, leafy : radical leaves subovate, 

 petioled, sometimes 1 or 2-toothed ; cauline spatulate: fruiting raceme elongated: 

 pod oral or e/iipsoidal, a little longer than the style and a little shorter than the 

 upwardly curving spreading pedicel. — Mountains of Colorado and Wyoming, 

 also in California and Oregon. 



4. V. alpina, Nutt. Dwarf and cesjn'tose : leaves linear-spatulate, entire : 

 flowers in short corymbose racemes, large for the size of the plant : pod 

 inflated be/oic, compressed at the summit, shorter than the style, densely clothed with 

 stellate hairs. — W. Wyoming and S. W. Montana. 



15. SUBULAEIA, L. Awlwort. 



A dwarf stemless aquatic, smooth, with tufted subulate leaves, few minute 

 white flowers, and no style. 



1. S. aquatica, L. Scapes 1 to 3 inches high: leaves usually shorter 



than the scapes : flowers scattered : petals not exserted : pods obtuse, about 



equalling the pedicels. — In great abundance at the head of Yellowstone 



Lake, Parry. The next stations to the east are in New Hampshire and 

 Maine. 



16. CAP SELLA, Mcench. Shepherd's Purse. 



Slender and mostly smooth annuals, with small white flowers and simple or 

 pinnate leaves. 2 



1. C. divaricata, Walp. Glabrous, very slender and diffusely branched : 

 radical leaves pinnate or pinnatifid with few lobes ; the upper oblanceolate to 

 linear, entire: pods elliptic-oblong, on very slender spreading pedicels.— 

 Colorado, W. Wyoming, and westward. 



1 Camelina sativa, Crantz., is an annual, with lanceolate arrow-shaped leaves, and large 

 margined pods —Known as " False Flax," and introduced in Colorado, etc. 



2 C. Bursa-pa.ttnris, Mcench, is usually somewhat hirsute at base, with radical leaves 

 mostly runcinate-pinnatifid, cauline lanceolate and auricled at base, and pods cuneate- 

 triangular, truncate above. — Naturalized wherever civilized man is found. 



