LILY FAMILY 



44; 



2. Yucca mohavensis Sarg-. Mojave Yucca. Fig-. 1099. 



Yucca mohavensis Sarg. Gard. & Forest. 9: 104. 1896. 



A small tree or shrub. 5 m. high or less, with a 

 simple or branched trunk, 15-20 cm. in diameter, 

 the surface dark brown and scaly or often clothed 

 to the ground with living leaves. Leaves 45-50 cm. 

 long, about 3-4 cm. wide, thin and concave, smooth, 

 with a stout sharp-pointed apex, the margins sepa- 

 rating into long pale filaments ; flowers in dense 

 sessile or short-stalked panicles 30-50 cm. long ; 

 perianth-segments creamy white or the outer sur- 

 face often purplish, 25-45 mm. long; filaments more 

 or less hairy; st3de short; fruit 7-10 cm. long, about 

 half as broad, baccate. ' 



Arid desert regions, Lower Sonoran Zone; southern Xe- 

 I'ada and northwestern Arizona, to western edge of the Mojave 

 Desert and northern Lower California, extending into the 

 ;oastal region in the San Gorgonio Pass and the mesas and 

 foothills of Riverside and San Diego Counties, California. 

 Type locality: only the general distribution given. 



3. Yucca baccata Torr. 

 Fleshy-fruited Yucca. Fig. 1100. 



i'licca baccata Torr. Bot. Me.x. Bound. 221. 1859. 



Caudex very short, usually appearing acau- 

 lescent, bearing a tuft of leaves on the ground 

 or but little above. Leaves pale bluish green, 

 4-6 dm. long, rigid, with a few coarse fibres on 

 the margin ; panicle 5-9 dm. long ; perianth- 

 segments 6-8 cm. long, appressed to above the 

 ovary then spreading; filaments papillate; style 

 2-3 cm. long; fruit conical, very large, often 

 15-20 cm. long. 



Rocky hillsides in the piiton belt, Upper Sonoran 

 Zone; Providence Mountains, southeastern California 

 to southern Colorado and New Mexico. Type locality: 

 ■"high tablelands between the Rio Grande and the Gila." 



23. HESPEROYUCCA (Engelm.) Baker, Kew Bull. 1892: 8. 1892. 



Low plants with a short woody caudex, densely clothed with straight needle-pointed 

 rough-margined flat leaves. Flowers borne in large panicles on an elongated erect flower- 

 ing stem; perianth-segments thin concave. Stamens 6; filaments enlarged above; antheis 

 versatile. Style short, slender ; stigma capitate, long-papillate. Fruit an incompletely 6- 

 celled capsule, loculicidal; seeds thin flat, lustrous black. [Greek, meaning western yucca.] 



A monotypic i;tnus peculiar to southern California. 



1. Hesperoyucca whipplei (Torr.) Baker. 

 Spanish Bayonet. Fig. 1101. 



Yucca whipl^lci Torr. Bot. Hex. Bound. 222. 1859. 



Yucca graminifolia Wood, Proc. Acad. Philad. 1868: 167. 1868. 



Hesperoyucca whipplei Baker, Kew Bull. 1892: 8. 1892. 



Subacaulescent with a short woody caudex, densely 

 clothed by the needle-pointed leaves, forming a rounded 

 clump about 50 cm. broad, or sometimes broader with sur- 

 rounding daugiiter clumps formed from suckers. Leaves 

 spreading in all directions, 20-45 cm. long, 15-20 mm. wide, 

 rigid, glaucous, finely but sharply denticulate, tipped with 

 a slender very sharp spine ; flowering stalk 2-A m, higli, 

 often 7-10 cm. in diameter, glabrous ; panicle 1-1.5 m. long, 

 oblong; flowers pendent, fragrant, with creamy white peri 

 anth-segments. 35-50 mm. long; capsule 3-4 cm. long, 25 

 mm. broad. 



On chaparral-covered hills and mesas. Upper Sonoran Zone; Mon- 

 terey and San Benito Counties in the Coast Ranges, and Tule River in 

 the Sierra Nevada to northern Lower California. Type locality: near 

 San Pasqual, California. 



