2000 



YUCCA 



tivated in the western states, but emerges from the pupa 

 too late to pollinate }'. glauca and disappears too early 

 for y. gloriosa. See Rept. Mo. Bot. Gard. 3:99; 4:181. 

 The great Yuccas, or "Yucca Palms," of southern 

 California (Fig. 2760) are chiefly T. arborescens. They 



2763 Flower of Yucca 



Whipplei. 



Three petals removed 



to show structure of 



blossom. 



grow in the higher lands bordering the Mojave and ad- 

 jacent deserts, reaching a height of 15-20 ft. The old 

 plants are exceedingly weird and picturesque. Occa- 

 sionally this species is transferred to gardens, but it is 

 apparently not in the trade. 



INDEX. 



A. Fr. erect, capsular: seeds thin 

 and flat 



E. Stigma nipil.il,'. >„i ,i shnder 



style 1. Whipplei 



BE. Stigmii .:- ny i:-l„l„;l, tmni- 



naliinj ii .s/.^iil ^tjilr 2 filamentosa 



:!. Ilaccida 

 4. glauca 

 AA. Fr. pendent, not dehiscent. 



B. Seeds thin: fr. wall thin and 

 soon dry: Ivs. nsiially en- 

 tire 5. gloriosa 



BB. Seeds thick: fr. pulpy, sweet 

 and edible. 

 C. The fr. withnut a core, pur- 

 ple ■ fhsh.d .- Ir.i. rungh- 



miirqiii. <l fi. aloiiolia 



cc. The fr. .rill, i.„i:rr,i core 



an. I ,irll„,r,sl, fl.sh. 



D. it'*-. roiigJi-Miiryiiied 7. Guatemalensis 



PD. livs. with detaching mar- 

 ginal fibers when adult. 8. Treculeana 

 9. baccata 



1. Whipplei, Torrey (K. 5rra»!J«i7d!ia,Wood. Y.Cali- 

 fdrnica and V. Ortgiesidria, Hort.). Figs. 2761, 2763. 

 Acaulescent: Ivs. ^o in. wide, stilf, flat, striate, glau- 

 cous, needle-pointed, rough-margined : panicle very 

 tall, narrow, l.in- - st.ilki-.l. c.ast Range, California. 

 G.C. II. 6:i:iil. Ill,, :;:,. p, r,r,i. IMI. l.shii, p. 61. B.M. 

 76B2. Rep. I\lo. I'.mi. ( lar.l. :;. jil. II. Vl.:,i,. R.H. 1884:324 

 (as var. vioh'irr.i ]. c.l'. s: n.">. -i (rows everywhere in 

 southern Calif, and is a glorious sight when in bloom. It 

 is an easy plant to handle and has been known to flower 

 in three years from seed. Because of its peculiar stigma, 

 this is sometimes placed in a distinct genus, Hespero- 

 yucca. 



YUCCA 



2. filamentdsa, Linn. Figs. 27(',2, 27r,4-.5; 1052. Some- 

 times called Adam's Neem.i. I'.i \!. <;i;a-^s. Silk Grass, 

 or Thready Yucca. Acan]. i l n. wide, rather 



weak, somewhat concavi-. i yming, short 



and stout, pointed from tin lui. .1|.^, « iih curly mar- 

 ginal fibers: panicle loose, li-i,^ suilktd ; fls. creamy 

 white; style white. Southeasteru V. H. B.M. 900. A 

 yellow- or white-margined form is var. variegata, Carr. 

 B.B. 1:427. Var. conc4va, Engelm. (J'. co)iC()c.(, Haw.). 

 Lvs. broadly spatulate, plicate, concave. N. C. 



3. fliccida, 

 Carr.). Lvs. 

 gradually t:qn 

 Eastern U. S. 

 vated for the ] 

 Vars. exigua 



niihh-ula, 1 

 ible. 



and less curly libers. 

 H.H. 22:1805. B.M. 6316. -Usually culti- 

 recr-ding, and comprising several forms, 

 nd Integra have the leaf-margin brown, 



without detaching fibers. 



4. glatlca, Nutt. ( F. an 

 buryi. Baker). Fig. 2766. 

 thi: ■ •- - 

 wh 



selves, whitish green: panicle with 1 or 2 short branches 

 within the cluster of leaves, or usually reduced to a ra- 

 ceme: fls. greenish; style green. Rocky mountain region 

 and plains. B.M. 2236. G.F. 2:247. Rept. Mo. Bot. Gard. 

 6, p. 7. B.B. 1:427. -Var. stricta,Trel.( r. stricta, Sims). 

 Inflorescence freely branched at top of the leaf -cluster. 

 Southern plains. B.M. 2222. 



5. gloridsa, Linn. Nearly stemless or with slender 

 trunk, 10-15 ft. high : lvs. 1-2 in. wide, thin but not re- 



''^m 



curved, somewhat concave, glaucous when young, pun- 

 gently pointed, brown-margined: panicle with ascend- 

 ing branches, short-peduncled: fls. often with a reddish 

 or brownish shading. Carolina coast region.— A form 



