3] 4 LILJACEAE 



2. Y. brevifolia Engelm. JOSHUA TREE. Tree commonly 16 to 30 feet high 

 with an open crown of arm-like branches, the columnar trunk 8 to 15 feet high 

 and 1 to 3V2 feet in diameter; bark dark brown, checked into small squarish 

 plates; leaves 6 to 9 inches long, the margin denticulate, not shreddy; flowers 

 greenish white, congested in a heavy panicle 8 to 14 inches long; perianth- 

 segments very thick and fleshy, l 1 /^ to 2 inches long; stamens % length of the 

 pistil, the filaments subglobose-dilated at the recurved apex ; stigmas 3, obscurely 

 2-lobed ; capsule oblong-ovate, slightly 3-angled, 2 to 4 inches long and iy 2 to 2 

 inches broad ; seeds with ruminated endosperm. 



Mesas, Mohave Desert, widely distributed and forming extensive groves, north 

 to eastern Kern Co. and to Inyo Co. East through Nevada to Utah. 



Locs. Lancaster; Antelope Valley; Mohave; Kramer; Barstow, Jepson 4816; Coolgardie, 

 Jepson 6631; Warrena Well; Cottonwood Mts. ; New York Mts., Jepson 5443; Owens Lake; 

 Kern Valley. 



Kefs. YUCCA BKEVIFOLIA Engelm.; Wats. Bot. King, 5:496 (1871) ; Jepson, Silva Cal. 170, 

 pi. 54 (1910). Y. draconis var. arborescens Torr. Pac. R. Eep. 4:147 (1857), type loe. e. 

 Mohave Desert, Bigelow. . arborescens Trel. Eep. Missouri Bot. Gard. 3:163, pis. 5, 49 

 (1892); Sarg. Silva N. Am. 10:19, t. 502 (1896); Merriam, N. Am. Fauna, 7:353 (1893), 

 contains an extensive list of stations. Clistoyucoa arborescens Trel. Rep. Mo. Bot. Gard. 13:41 

 (1902). C. brevifolia MacBride, Contrib. Gray Herb. n.s. 53:6 (1918). 



3. Y. mohavensis Sarg. SPANISH DAGGER. Trunk simple or shortly 

 branched, 3 to 7 or 15 feet high, or sometimes very short or almost none ; leaves 

 concave, light yellow-green, entire on the margin, 1*4 to 3 feet long; flowers in 

 a panicle 1 to 1% feet long; filaments narrowly dilated below (especially those 

 opposite the inner segments), somewhat clavate at apex, nearly as long as the 

 pistil; style very short; stigma 3-lobed, each lobe notched at apex; capsule 

 cylindric, fleshy, 2% to 4 inches long and 1 to l 1 /^ inches thick, usually con- 

 stricted about the middle ; endosperm not ruminated. 



Mohave Desert south through the San Jacinto and Santa Rosa mountains to 

 northern Lower California, extending west to the San Bernardino Valley and 

 the coast near San Diego. East into Arizona and southern Nevada. 



Locs. Calico Mts. ; Ord Mt., Jepson 5848 ; Warrens Well ; Cottonwood Mts. ; San Gorgonio 

 Pass, Jepson 6068; Palm Canon, Mt. San Jacinto, Jepson 1411a; San Timoteo Canon, Hall 

 5751 ; Santa Rosa Mt., Hall 1905 ; San Felipe Valley, Jepson. 



Refs. YUCCA MOHAVENSIS Sarg. Gard. & For. 9:104 (1896), type loc. Mohave Desert, 

 Sargent, Silva N. Am. 10:15, t. 500 (1896); Jepson, Silva Cal. 171 (1910). Y. baccata 

 Engelm. Trans. St. Louis Acad. 3:44 (1873), in part; Wats. Bot. Cal. 2:164 (1880), in part; 

 Parish, Gard. & For. 4:136 (1891). Y. macrocarpa Cov. Contrib. U. S. Nat. Herb. 4:202 

 (1893). 



4. Y. baccata Torr. SPANISH BAYONET. Very similar to Y. mohavensis; 

 leaf rosettes yellow-green, on the ground, rarely rising above it ; leaves 1*4 to 2 

 feet long; flowering stem 2 to 3*4 feet high ; flowers (2 1 /2 or) 3 to 4 inches long ; 

 base of filaments forming fleshy papillae ; style much elongated ; fruit conical. 



Eastern Mohave Desert. East to Colorado and New Mexico. 

 Locs. Providence Mts., T. Brandegee; New York Mts., Pariah 10281. 

 Refs. YUCCA BACCATA Torr. Bot. Mex. Bound. 221 (1859), type loc. Parras, Coahuila, 

 Mex., Thurber; Trel. Rep. Mo. Bot. Gard. 13:109, pis. 68, 69 (1902). 



22. NOLINA Michx. 



Perennials with linear rigid leaves crowded in a rosette at the ground. 

 Flowering stem stout, naked. Flowers polygamo-dioecious, much congested in 

 a compound panicle ; pedicels jointed near the base. Perianth whitish, persistent, 

 its segments 6, distinct, elliptic to lanceolate. Stamens 6 ; filaments very short. 

 Ovary deeply 3-lobed ; ovules 2 in each cell, basal ; style very short ; stigmas 3, 

 short, recurved. Capsule broadly 3-winged, membranous, tardily dehiscent, locu- 

 licidal or bursting irregularly ; seeds often solitary. Species 24, southern United 

 States and Mexico. (P. C. Nolin, French agricultural essayist, middle of the 

 eighteenth century.) 



