378 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Fruit obtuse; leaves of about the 
same color on both surfaces, 
broadly obtuse at the base; 
stems or petioles or both hir- 
sute; panicle loosely branched. 
Fruit acutish; leaves paler be- 
low, mostly narrowed or 
cuneate at the base; inflor- 
escence mostly axillary, sel- 
dom forming a much- 
branched panicle. 
Leaves strongly apiculate_____ 12. B. viscosa 
apiculata, 
Leaves not strongly apiculate. 
Stems  glandular-pubescent ; 
peduncles and pedicels al- 
ways glandular__ ~~ ___- 12. B. viscosa, 
Stems almost glabrous, or 
pulverulent below________- 12b. B. viscosa 
oligadena, 
Flowers forming slender, simple, spike- 
like racemes, which are usually ar- 
ranged in panicles; annuals. 
Ribs 4, very acute; bracts large and 
persistent; fruit very obtuse or 
truneate above _-_------___-___-_- 1 
Ribs 5; fruit never truncate above. 
Ribs of the fruit thick, smooth, 
obtuse, with very narrow, al- 
most straight channels between 
them. 
Stamens included; stems very 
finely puberulent; plant 
spreading and much 
branched; leaves thin____- 1 
Stamens exserted; stems 
more or less hirsute below, 
especially in young plants; 
flowers 2 mm. long or 
“" more, forming thicker 
spikes____~_-_--_-________ 14. B. coulteri. 
Ribs of the fruit thin, acute, 
rugulose, with wide and _ shal- 
low spaces between them. 
Stamens included; flowers 
about 1 mm. long; bracts 
lanceolate; plant = glandu- 
lar______- eee 1 
Stamens exserted. 
Flowers 2 mm. long, con- 
spicuously brown- 
nerved; stamens 1 or 
2; bracts ovate, red- 
dotted___-__.----.--_.. 15. B. spicata, 
n 
B.wrightii. 
. B. watsoni, 
. B, torreyana. 
