274 DRACAENACEAE 



3. Yucca tenuistyla Trelease. Caudex short : leaves pliable, mostly recurved and 

 5 dm. long, 1-1.5 cm. 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 cm. long : seeds 8-10 mm. long. 



In dry soil, northeastern Texas. Summer. 



4. Yucca conatrfcta 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 cm. long : seeds about 9 mm. long. 



On plains, southwestern Kansas, southward to the Rio Grande. Spring and summer. 



5. Yucca glauca 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 Arkansana 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 Louisiannsis Trelease. Caudex short : leaves pliable, 5-7 cm. long, 1 

 cm. to rarely 4 cm. 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 F. 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 cm. 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 gloriosa 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 recurvifolia 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 aloifolia 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 Treculeana 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 

 cm. long, acute or acuminate : capsules berry-like," nodding, indehiscent, 7-10 cm. long, 

 beaked. 



In sandy or dry soil, southern Texas and adjacent Mexico. Spring and summer. 



