18 
6. L. recurvata Watson. Annual, thinly pubescent: leaves entire, oblong-oblan- 
ceolate or spatulate, short: flowers yellow: pods 2 to 4 mm. broad, with style about 
as long.—Central Texas. 
+ + Pods suberect on ascending or curved pedicels. 
++ Annuals: pods often stipitate. 
7. L. Lindheimeri Watson. Pubescence very fine or compactly lepidote: stems 
erect or ascending: leaves oblong to narrowly oblanceolate, repand or dentate: pods 
4mm. broad, with a short stipe and style rather shorter than the pod; cells 6 to 8- 
ovuled.—On ‘black stiff prairie soil” on the lower Guadalupe (Victoria County). 
8. L. gracilis Watson. Pubescence very fine, usually scanty: stems slender and 
usually Jax: leaves narrowly oblanceolate, entire or sparingly repand: pods stipitate, 
3 to 4 mm. broad, on slender often elongated pedicels, and with style nearly or quite 
as long; cells 4 to 6-ovuled.— From the lower Rio Grande northward through central 
Texas. Var. SESSILIS Watson, with sessile pods, is found in western Texas. 
9. L. Gordoni Watson. Ofien low, pubescence somewhat coarser: leaves linear- 
oblanceolate, entire or rarely repand: pods stipitate, 4 mm. broad, with shorter style; 
cells 6-ovuled.—An early bloomer in the valleys of southern and western Texas. Var. 
SESSILIS Watson has pods sessile or nearly so and often pubescent.—With the species. — 
4s «+ Biennials or perennials: pods sessile or nearly go, onascending or spreading pedicels. 
= Pubescence evidently stellate. 
10. L. Engelmanni Watson. Pubescence dense, caudex usually much branched: 
stems often dwarf, usually simple: leaves ovate and petiolate to linear-oblanceolate, 
or the upper linear-spatulate, entire or slightly repand: raceme usually short: pods 
substipitate, 6 mm. broad, style as long.—Central and western Texas. Very variable 
in its leaves, some extreme forms having very narrow and entire leaves and others 
broad and sinuate-dentate leaves. 
11. L. argyrea Watson. Pubescence more or less dense, caudex often simple: 
leafy stems decumbent or procumbent: leaves ovate and petiolate to narrowly oblan- 
ceolate, entire or repand: petals often turning purple: pods sessile, in a long raceme, 
4to 5 mm. broad, style as lung or shorter.—From the lower Rio Grande to the moun- 
tains of western Texas. 
— — Pubescence compactly lepidote, rarely evidently stellate. 
12. L. Fendleri Watson. Caudex much branched, often dwarf, stems simple: 
leaves numerous, entire, mostly narrowly linear-oblanceolate : pods in a dense usually 
short raceme, 4 to 6 mm. long, sometimes ellipsoidal or acutish, with style usually as 
long.—Western Texas. 
8. DRABA Dill. (WHITLOW-GRASS.) 
Low herbs, with stellate pubescence, entire or toothed leaves, small 
white flowers (in ours), and short ovate to oblong or linear pods flat- 
tened parallel to the broad partition.—Our species belong to § DRA- 
BELLA, and are winter annuals, with short leafy stems, oblong or 
obovate hairy sessile leaves, and no style. 
1. D. Caroliniana Walt., var, MICRANTHA Gray. Branches often decumbent, the 
peduncles scape-like: leaves entire: pedicels clustered or approximate : flowers very 
swall: pods linear, subappressed-hispid.—Stony places, western Texas. 
2, D. cuneifolia Nutt. Leaves cuneate-obovate to oblanceolate, coarsely few- 
toothed or entire: pedicels more remotely racemose and raceme pedunculate: pods 
linear-oblong, usually acutish, shortly subappressed-hispid.—One of the earliest 
bloomers in the valleys of southern and western Texas. Var. PLATYCARPA Watson 
has oblcng-oval usually obtuse pods.— With the type, and perhaps the commoner 
form, 
