2000 YUCCA 



tivated in the western states, but emerges from the pupa 

 too late to pollinate Y. 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. 2700) 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. 



aloifolia, 6. 

 Andreana, 5. 



angusti folia, 4. 

 argospatha, 8. 

 aspera, 8. 

 baccata, 9. 

 Califomica, 1. 

 canal iculata, 8. 

 Carrierei, 5. 

 coneava, 2. 

 Conspicua, 6. 

 Deleuili, 5. 

 draea'noides, 5. 

 Draeonis, 6. 

 elegans, 5. 

 Ellacombei, 5. 



INDEX. 



ensifera, 5. 

 exigua, 3. 

 filamentosa, 2. 



flaccida, 3. 

 flexilis, 5. 

 glauca, 4. 

 gloriosa, 5. 

 gram mi folia, 1. 

 Guatemalensis, 7. 

 Hanburyi, 4. 

 integra, 3. 

 juncea, 5. 

 lii'iiijata, 5. 

 longifolia, 8. 

 margin ata, 5, 6. 

 Alasxiliensis, 5. 



metlio-striata, 5. 

 nobilis, 5. 

 orchioides, 3. 

 Ortgiesiana, 1. 

 pendula, 5. 

 plicata, 5. 

 pubenda, 3. 

 quadricolor, 6. 

 reenrvifolia, 5. 

 striatula, 5. 

 stricta, 4. 

 sulcata, 5. 

 Treeuleana, 8. 

 Vandervinn iana, 

 v.-iricgata, 2, 5. 

 Whipplei, 1. 



L. Fr. erect, capsular: seeds thin 

 and flat 



b. Stigma capitate, on a slender 



style 1. Whipplei 



BB. Stigma 8- or 6-lobed, termi- 

 nating a stout style 2 filamentosa 



3. flaccida 



4. glauca 

 k. Fr. pendent, not dehiscent. 



B, Seeds thin: fr. wall thin and 

 soon dry: Ivs. usually en- 

 tire 5. gloriosa 



BB. Seeds thick: fr. pulpy, sweet 

 and edible. 

 C. The fr. without a core, pur- 

 ple - fleshed : Ivs. rough- 



CC. The fr. with papery core 

 and yellowish flesh. 



d. Lvs. rough-margined 7. 



dd. Lvs. with detaching mar- 

 ginal fibers when adult. 8. 



Guatemalensis 



Treculeana 

 baccata 



1. Whipplei, Torrey (Y. graminifdlia, Wood. Y.Cali- 

 tdrnica and Y. Ortgiesiana, Hort. ). Figs. 2761, 2763. 

 Acaulescent: lvs. 3l) in- wide, stiff, flat, striate, glau- 

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

 tall, narrow, long -stalked. Coast Range, California. 

 G.C. II. 6:196. Gn. 35, p. 561. R.H. 1886, p. 61. B.M. 

 7662. Rep. Mo. Bot. Gard. 3, pi. 11,12,54. R.H. 1884:324 

 (as var. violacea). G.F. 8:415. — Grows 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- 

 Jucca. 



YUCCA 



2. filamentdsa, Linn. Figs. 2762, 2764-5; 1052. Some- 

 times called Adam's Needle, Bear Grass, Silk Grass, 

 or Thready Yucca. Acaulescent: lvs. 1 in. wide, rather 

 weak, somewhat concave, glaucous when young, short 

 and stout, pointed from the acute apex, with curly mar- 

 ginal fibers: panicle loose, long-stalked: fls. creamy 

 white; style white. Southeastern U. S. B.M. 900. A 

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

 B.B. 1:427. Var. coneava, Engelm. (Y. coneava, Haw.) 

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



3. flaccida, Haw. (Y. pubSrula, Haw. Y. orchioides 

 Carr.). Lvs. more flexible, recurving, not pungent 

 gradually tapering, with thinner and less curly fih 

 Eastern U. S. B.R. 22:1895. B.M. 6316.-Usually culti 

 vated for the preceding, and comprising several forms 

 Vars. exigua and Integra have the leaf-margin brown 

 without detaching fibers. 



4. glauca, Nutt. (Y. angustifdlia, Pursh. Y. Hdn 

 buryi. Baker). Fig. 2766. Lvs. less than X A in. wide 

 thin but stiff, flat, acutely and pungently pointed, with 

 white margin from which slender fibers detach them 

 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.( Y. stricta, Sims) 

 Inflorescence freely branched at top of the leaf-cluster, 

 Southern plains. B.M. 2222. 



5. gloriosa, Linn. Nearly stemless or with slender 

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



2764. Adam's Needle— Yucca filamentosa. 

 From a plant 4 feet high. 



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 



