274 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
16. LESQUERELLA §S. Wats. BLApDDER-Pop. 
Low herbaceous annuals or perennials, stellate or lepidote-hoary; leaves entire or 
repand-toothed; flowers mostly yellow, purplish white in one species; pods globose to 
ovoid, inflated, with nerveless valves; seeds several, in two rows in each cell; septa 
and styles persistent. 
KEY TO THE SPECIES. 
Flowers purplish white. 0... 2.2.22 2.2.2.0 2 cece cece ee eee eee 1. L. purpurea. 
Flowers yellow. 
Plants tall, 30 cm. or usually more, erect; pedicels reflexed from 
the base; annual. .........0020. 00000... e cee eee eee 2. DL. aurea. 
Plants lower, usually less than 20 cm., ascending, erect, or pros- 
trate; pedicels erect, or reflexed from about the middle, 
never from the base; perennials or rarely annuals. 
Capsules lepidote-stellate. 
Pods compressed at the top. 
Plants densely cespitose, 6 cm. high or less; 
cauline leaves crowded. ................. 6. L. intermedia. 
Plants not densely cespitose, 15 cm. high; cau- 
line leaves remote. .................00---- 7. L. valida. 
Pods not compressed at the summit. 
Capsules pointed at the apex, 7 to 8 mm. long; 
cauline leaves narrowly oblanceolate, 
acutish. . 2.22. .00 22222 c eee 3. L. montana. 
Capsules rounded at the apex, 4.5 mm. long or 
less; cauline leaves various. 
Capsules 3 mm. long; cauline leaves broadly 
oblanceolate... .....2.-...2......... 4. D. lata. 
Capsules 4.5 mm. long; cauline leaves linear- 
oblong or linear-oblanceolate......... 5. DL. rectipes. 
Capsules glabrous. 
Plants annual; pedicels reflexed above the middle in 
age... 22... wo ee cc ence en een ence rcncccceenecs 8. L. gordoni. 
Plants perennial (sometimes blossoming the first year); 
pedicels erect, stout. 
Flowers not exceeding the leaves; pedicels arising 
from a common point, or axillary. (Plants 
densely cespitose, 4 to 6 cm. high; basal 
leaves linear-oblanceolate)............... 9. L. praecox. 
Flowers much exceeding the leaves, in more or 
less elongated racemes. 
Plants low, 5 cm. high or less; basal leaves 
ovate to orbicular, as broad as long..... 10. L. ovalifolia, 
Plants taller, usually more than 10 cm.; basal 
leaves broadly oblanceolate or narrower, 
always much longer than broad. 
Plants white with very dense lepidote 
pubescence; leaves linear or linear- 
oblanceolate, thick..............11. L. fendleri. 
Plants greener, the pubescence much less 
dense; leaves oblanceolate or spatu- 
late, thin. 22.2.2 12. L. pinetorum. 
