274 DRACAENACEAE 
3. Yucca tenuistyla Trelease. Caudex short: leaves pliable, mostly recurved and 
5 dm. long, 1-1.5 em. wide, long-attenuate, white-margined, with slender marginal fibers : 
flowering stem about 1 m. tall: panicle-branches glabrous or merely puberulent : sepals 
and petals relatively narrow : capsules 5-6 em. long: seeds 8-10 mm. long. 
In dry soil, northeastern Texas. Summer. 
4. Yucca constrícta Buckl. Caudex short, or several dm. long: leaves firm, spread- 
ing, 4—6 cm. long, about 1 cm. broad, attenuate, white-margined, with fine marginal fibers : 
flowering stem 1-1.5 m. tall: panicle rather broad : perianth globular, the sepals and 
petals relatively broad : capsules 4.5-5.5 em. long : seeds about 9 mm. long. 
On plains, south western Kansas, southward to the Rio Grande. Spring and summer. 
5. Yucca glaüca Nutt. Caudex short or somewhat elongate, prostrate and crawl- 
ing: leaves firm, commonly 1 m. long, 6-12 mm. wide, mostly ascending, white-mar- 
gined, sparingly filiferous: flowering stem 1-2 m. tall, simple or with an occasional 
branch near the caudex, flower-bearing nearly to the base: raceme glabrous: perianth 
greenish white: sepals and petals acute: capsules 6—7 cm. long, roughened : seeds lus- 
trous, 11-13 mm. long. 
On plains, South Dakota and Wyoming to Missouri, Texas and New Mexico. Summer. 
6. Yucca Arkansàna Trelease. Similar to Y. tenuistyla in habit, but leaves rather 
broader: flowering stem about 1 m. tall, simple or with a few branches near the caudex, 
flower-bearing nearly to the base: perianth greenish white : sepals and petals obtuse : cap- 
sules 5-6 cm. long, smooth : seeds dull, about 10 mm. long. 
On prairies, Arkansas and the Indian Territory to eastern Texas. Summer. 
7. Yucca Louisianénsis Trelease. Caudex short: leaves pliable, 5-7 cm. long, 1 
em. to rarely 4 em. wide, white-margined, sparingly filiferous: flowering stem 1-2 m. tall, 
the panicle mostly shorter than the unbranched portion: perianth white, campanulate : 
capsules 4-5 cm. long, irregularly angled while maturing like that of Y. flaccida: seeds 
‘6-10 mm. long. 
In dry soil, the Indian Territory to Louisiana. Spring and summer. 
8. Yucca rupicola Scheele. Caudex short: leaves usually firm or relatively so, 
3-5 dm. long, 2.5-3 em. wide, glaucous, often twisted, the serrulate margin early becom- 
ing brown: flowering stem 1-2 m. tall, the panicle usually shorter than the unbranched 
portion, glabrous: perianth white or greenish, globular: sepals and petals acute, 3.5-4 
cm. long : capsules about 6 cm. long, thin-walled: seeds dull, 7-9 mm. long. 
In dry soil, southern Texas. Spring and summer. 
9. Yucca gloriósa L. Caudex tall, usually simple: leaves numerous, nearly linear, 
from a constricted base, 3-5 dm. long, rigidly pointed, smooth throughout : panicles showy, 
conic, 5-10 dm. long: perianth white, 4-5 cm. long: sepals and petals lanceolate or ob- 
long-lanceolate, acute: capsules leathery, nodding, nearly oblong, constricted at or near 
the middle, indehiscent, 5-6 cm. long: seeds lustrous, 6-7 mm. long. 
On the coast, North Carolina to Florida. Spring. SPANISH BAYONET. 
10. Yucca recurvifólia Salisb. Caudex commonly 1-2 m. tall, branching: leaves 
numerous, recurving, smooth-margined or eventually so: panicle narrow, but little raised 
above the leaves: capsules erect, 5-7 cm. long, indehiscent, the 6 ribs winged : seeds dull, 
7-8 mm. long. 
In sand, coast of Georgia, Alabama and Mississippi. Spring and summer, 
11. Yucca aloifdlia L. Caudex 10-25 dm. tall, commonly branching: leaves nu- 
merous, spreading above, deflexed below and falling from the lower part of the caudex, 3-9 
dm. long, rigidly pointed, scabrous-margined, more or less constricted between the middle 
and the dilated base: panicle ample, showy, conic, 3-6 dm. long: perianth white, often 
tinged with purple, 4-6 cm. long: sepals and petals oblong to elliptic: capsules pulpy, ob- 
long, indehiscent, nodding, 7-9 cm. long. 
In sandy soil, North Carolina to Florida and Louisiana. Spring and summer. 
12. Yucca Treculeàna Carr. Caudex 18-75 dm. high, usually branching above: 
leaves numerous, 7-13 dm. long, rigid, straight, entire: panicles showy, 6-12 dm. long, 
many-flowered : perianth cream-white : sepals and petals ovate or ovate-lanceolate, 4-6.5 
em. long, acute or acuminate: capsules berry-like, nodding, indehiscent, 7-10 em. long, 
beaked. 
In sandy or dry soil, southern Texas and adjacent Mexico. Spring and summer. 
