210 CRUCIFERAE (MUSTARD FAMILY) 



denticulate: flowering raceme short and dense, more open in fruit: siliques 

 very slender, 4-8 cm. long, widely spreading or recurved, on filiform pedicels 

 half as long. Colorado and Utah and southward. 



4. Thelypodium torulosum Heller, Bull. Torr. Bot. Club 25: 265. 1898. 

 Glabrous and somewhat glaucous: stems erect, rather weak, branching above, 

 4-7 dm. high: leaves from lanceolate below to linear above, auricled-sagittate, 

 clasping: flowers lilac-colored: petals 12-15 mm. long: silique slender, nar- 

 rowed to a substipitate base, ascending-torulose, 4-7 cm. long: pedicel di- 

 varicate, 8-12 mm. long. T. sagittatum. Western Wyoming, westward and 

 northward. 



5. Thelypodium elegans Jones, Zoe 4: 265. 1894. Smooth and glaucous: 

 stems simple or branched from the base, rather closely leafy below: radical 

 leaves early deciduous; cauline leaves cordate-clasping, ovate, or ovate- 

 lanceolate, acute, 15-35 mm. long: flowers opening at the summit of the 

 raceme which becomes greatly elongated in fruit: petals pale purple: siliques 

 sessile, on pedicels less than 1 cm. long, straight or curved, ascending, rather 

 thick-linear, 5-7 cm. long. Western Colorado and adjacent Utah. 



6. Thelypodium ajireum Eastw. Zoe 2: 227. 1891. Glaucous but sparsoly 

 retrorsely hairy on the lower part of the stem, branched from the base, 3-4 drn. 

 high: radical leaves oblanceolate, dentate, on margined petioles; caulino 

 ovate, auriculate-clasping, acuminate: sepals and petals bright yellow: siliqucs 

 very slender, 4-6 cm. long, short-stipitate, nearly erect, on short spreading 

 pedicels. Mancos, Colorado. 



7. Thelypodium paniculatum A. Nels. Bull. Torr. Bot. Club 26: 123. 

 1899. Glabrous and glaucous perennial: stems simple below, paniculately 

 branched above: radical leaves oblong, short-petioled ; cauline sagittate clasp- 

 ing, subacute or obtuse, from oblong below to lanceolate above : petals white 

 or purplish, twice as long as the oblong-spatulate sepals, the limb obovate: 

 silique substipitate, pointed at apex, 20-30 mm. long, nearly erect, on short 

 spreading pedicels. T. Nuttallii. Wyoming and northwestward. 



8. Thelypodium micranthum (Gray) Wats. Bot. King's Rep. 5: 25. 1871. 

 More or less stellate-pubescent (or even quite glabrous), 3-9 dm. high: lower 

 and stem leaves oblanceolate, sinuately pinnatifid, stellate-pubescent; the 

 upper linear, entire, usually glabrous: flowers small, 2-3 mm. long: calyx 

 glabrous or pubescent: pod slender, subpendulous, about 2.5 cm. long, sessile, 

 with a very short thick style. (T. longifolium of most authors.) Colorado to 

 Texas and Mexico. 



4. CAULANTHUS Wats. WILD CABBAGE 



Coarse and more or less succulent herbs, with the leaves largely basal, 

 and greenish-yellow flowers in racemes. Sepals large, somewhat saccate at 

 base, usually purplish. Petals undulate-crisped, with a broad claw and nar- 

 row or obsolete blade. Anthers linear, sagittate. Silique subterete, sessile; 

 the style nearly wanting; the valves 1-nerved and often reticulate. 



Stem fleshy, hollow; flowers ascending . . . . . . .1. C. crassicaulis. 



Stem not hollow; flowers horizontal or deflexed . . . . . 2. C. hastatus. 



1. Caulanthus crassicaulis (Torr.) Wats. Bot. King's Rep. 5: 27. 1871. 

 Glabrous or nearly so, except the pubescent sepals: stems simple, erect, thick- 

 fleshy, hollow, 3-5 dm. high: leaves mostly basal, lyrately toothed or pin- 

 natifid ; cauline much reduced, linear or somewhat hastate : flowers subsessile, 

 rather large: silique ascending, slender, 7-12 cm. long. Western Wyoming 

 to Idaho and southern California. 



2. Caulanthus hastatus Wats. Bot. King's Rep. 5: 28. pi. 3. 1871. Glabrous, 

 simple or somewhat branched. 4-8 dm. high: leaves petioled, very variable; 

 radical lyrate or entire, the terminal leaflet ovate, hastate, or truncate at 

 base, the lateral leaflets very small; cauline ovate-oblong, entire, hastate, 

 rounded or cuneate at base : flowers in a loose virgate raceme, reflexed : sepals 

 narrow, distant: petals (sometimes nearly wanting) equaling the sepals, 



