AGAVE 



AGAVE 



237 



fls. \ 1 A in.; ovary Min., segm. Jim., tube J^in. E. 

 Mex. G.W. 8, p. 337. With prominent and persistent 

 pale band on the upper face it is var. univittata (A. 

 univittata, Haw. A. ensifera, Jacobi? A. temiata, 

 Hort.?). Ref. Hot. 215. B.M. 6655. G.C. II, 7, p. 368. 

 Crosses of A. univittata with A. xylonacantha are re- 

 ported, of which x A. perbella, Hort., is said to be one, 

 A. pulcherrima, Hort., in part, seeming to be another 

 writing for the same. 



38. heteracantha, Zucc. Like A. lophantha but Ivs. 

 somewhat sinuate and with variously hooked less equal 

 and closer prickles. The median band is often promi- 

 nent, S. Mex. G.W. 2, p. 605. G.C. II. 7, p. 369. Gt. 

 19, pi. 639. Most of what is called A. heteracantha is 

 A. Lecheguilla. 



cc. Teeth often large: Ivs. either broad or thick. 

 D. Margin nearly straight. 



39. Kerch&vei, Lem. Lvs. triangular, spreading, 

 3-4 x 16-20 in., thick, gray-green, not lined beneath, 

 with channeled gray spine and large spreading triangu- 

 lar teeth joined by a rather wide margin: infl. dense and 

 heavy, 18 ft. S. Mex. G.C. II. 7, p. 527. Formerly 

 much grown in a number of dissimilar types: var. 

 Beaucarnei (A. Beaucdrnei, Lem., A. Lemairei, Hort., 

 A. Kerchdvei coarctata, Hort.), with very short Ivs.; 

 var. macrod6nta, with larger and more hooked teeth; 

 var. distans, with more separated teeth which have a 

 well-developed accessory basal cusp in f . diplacantha, 

 and var. major, with a short branching trunk. Related 

 forms with shorter Ivs. and slenderer, sparser infl. are 

 A. triangularis, Jacobi (A. Kerchovei brevifblia, Hort., 

 A. horrida triangularis, Baker), Karsten & Schenck, 

 Veg. Bilder. pi. 46, with prickles much as in A. Ker- 

 chovei; and its var. rigidissima (A. rigidissima, Jacobi), 

 with small prickles lacking in f . subintegra. 



40. Rcezliana, Baker (A. hdrrida Ixvior, Hort.). Lvs. 

 ovate-lanceolate, spreading, 2-4 x 12-16 in., rather 

 thick, green, broadly pale-striped above, not lined on 

 the back, with grooved brown and then gray spine and 

 moderately large teeth joined by a moderate margin: 

 infl. not very heavy. S. Mex. G.C. 1871, p. 74; II. 7, 

 p. 528. F. 1870, p. 42. Presents as extreme forms: var. 

 Inghamii, Baker (A. Gilbeyi longifolia, Hort., A. Ing- 

 harni and A. Inghami gigantea, Hort.), with broad, 

 often concolorous Ivs. and large prickles, known when 

 dwarfed as var. Gubeyi (A. Gilbeyi and A. hdrrida Gil- 

 beyi, Hort.), Gt. 23, p. 89; 27, p. 84. Neubert's Gart. 

 Mag. 50, p. 15. G.C. 1873, p. 1305; and var. Peac6ckii 

 (A. Killischii, Hort.?, A. Peacockii, Croucher), B.M. 

 7757. G.C. 1873, p. 1400, with narrowly triangular- 

 lanceolate Ivs., sometimes entire. The names Regeliana, 

 Regelii and Regelii macrodonta, identified by Jacobi with 

 A. triangularis, seem also to have been applied to this; 

 and the now unrecognized A. drlichaut, A. horrida nana 

 and its f. Ixvior and A. hdrrida pygm&a of gardens may 

 belong here. A. Hanburii, Baker, suggests a possible 

 hybrid of this. 



41. Ghiesbrechtii, Koch (A. Ghiesbreghtii, Auct. A. 

 grdndidens,HoTt.'! A. grandidentata, Hort.? A.frdgilis, 

 Jacobi? A. squdlidens, Hort.?). Lvs. lanceolate, 3 4 x 

 10-12 in., upcurved-spreading, little if at all striped, 

 with inrollcd spine and moderate prickles joined by a 

 moderate margin. S. Mex.(7). G.C. II. 7, p. 621. The 

 typical clear green form varies into an equally large or 

 longer-lvd. form with smaller, closer-set prickles, var. 

 Leguayana, Baker (A. Leguayana, Hort., or, with wider 

 margin, f. laticincta), and a more compact and con- 

 cave Ivd., blue-green form, var. Rohanii, Baker (var. 

 obscura, Jacobi). A cross of A. filifera and A. Ghies- 

 brechtii is reported. 



42. hdrrida, Jacobi. Lvs. oblanceolate-oblong, spread- 

 ing, flat, rather thin, about 3 x 12 in., glossy green, 

 neither striped nor lined, with flat -grooved short 

 spine and large irregular prickles often with accessory 



cusps, joined by a heavy margin: infl. moderately slen- 

 der; fls. yellowish or purplish green, 1% in.; ovary and 

 segm. %in. each., tube J^in. Cent. Mex. B.M. 6511. 

 F. 1870, p. 42. Forms occur with larger revolute-mar- 

 gined Ivs.: var. Maigretiana (A. Maigretiana, Jacobi. 

 A. granuldsa, Scheidw.), G.W. 2, p. 593. S.H. 4, 

 p. 299. G.F. 2, p. 115; or with smaller prickles, var. 

 micracantha, Baker, Rep. Mo. Bot. Gard. 7, pi. 62, 63. 

 The names A. DeSmetiana (A . De Smettiana, Jacobi, 

 being a form or ally of miradorensis), A. Ghiesbreghlii 

 horrida, A. Mdrganii and A. Pllgrimii have been 

 applied in gardens to forms of this or one of the two 

 foregoing, not now recognized. 



DD. Margin with prominent fleshy hummocks 

 under the teeth. 



43. xylonacantha, Salm-Dyck, also written xylacdntha, 

 xylinacdntha and xylynacdntha (A. amurensis, Jacobi. 

 A. Kochii, Jacobi. A. Kdchii amurensis, Ellem.). Lvs. 

 oblong, concave, tortuously spreading, 2-5 x 12-24 in., 

 rough, dull gray-green, dark-lined beneath, with flexu- 

 ous channeled gray spine and very large often multiple 

 prickles saddling large green prominences, joined by a 

 moderately heavy margin: inn. rather slender; fls. 1^*2 

 in.; ovary %in., segm. iHiin., tube J^in. E. Mex. B.M. 

 5660. G.C. II. 7, p. 527. Lyon Hort. 1879, p. 207. 

 Extensively hybridized, some of its offspring recogniz- 

 able in their scabrid green-lined oblong Ivs. with green 

 prominences going into the bases of the large unequal 

 teeth: with attenuata or attenuata subdentata, chiapensis, 

 densiflora, filifera (x A. Villarum, Hort., x A. Vfllae, 

 Pirotta, x A. hybrida, Vill.), micracantha, univittata 

 (A. armata, Hort.? A. aspera, Tod.? Terraciano, 

 Primo Contr. pi. 3, 5, X A. hybrida, Versch.), A. xylo- 

 nacantha viltata and A . xylonacantha hybrida ( x A. per- 

 bella, A. xylonacantha perbella, Hort.), G.C. II. 7, p. 

 527, Verschaffeltii and xalapensis (x A. Pfersd6rffii, 

 Sim.). At one time, several varieties were listed: cor- 

 nuta or longifdlia, the more typical form, latifolia mac- 

 racdntha, variously spelled, major, Maximilidna, torta 

 and Vanderdonckii. A rare form with median variega- 

 tion is var. medio-picta. 



BBBBB. Lvs. 3-sided, short and very stiff, the detachable 

 horny margin toothless: fls. as in the preceding. 

 Trunkless. 



44. Victdriae Reginae, Moore (A. Considerdntii, 

 Duchartre). Lvs. in a globose cluster, triangular- 

 oblong, acutely 3-angled, 1-2 x 6-8 in., dark green, 

 with a short black triangular spine and gray margin 

 decurrent on the edges and keel: infl. 10-12 ft., rather 

 slender but compact; fls. 1J4 in.; ovary iHjin., segm. 

 j^in., tube J^jin.: caps, small. N. E. Mex. G.C. 1875, p. 

 484; 1880, p. 788; II. 18, p. 841; III. 1, p. 806. R.H. 

 1875, p. 429; 1890, p. 392; 1897, p. 100. G.W. 2, p. 

 592; 10, p. 213. G.Z. 20, p. 88, 135. Peacock, List of 

 Succ. PI. pi. S.H. 4, p. 287. I. H. 28, pi. p. 413. 

 Lyon Hort. 22, p. 371; 31, p. 146. R.B. 1876, p. 16. 

 G.M. 6, p. 196. Gn. 8, p. 351; 22, p. 448, 460; 48, 

 p. 117. Gt. 1878, p. 74. Journ. N. Y. Bot. Card. 7, p. 163. 

 Deleuil is said to have effected a cross with A. cteru- 

 lescens. Differing in its fewer-lvd. more open rosettes 

 and in the triple spines at apex of the Ivs. is A. Nickel- 

 siae, Hort. Both agree with the following filiferous spe- 

 cies in having the Ivs. white-marked by adherent cuti- 

 cle, and with the preceding marginate species in their 

 detachable horny border, and in fls. 



BBBBBB. Lvs. fleshy-fibrous, toothless (sometimes with 

 minute prickles at base), the margin typically 

 shredding away in fibers, as in Yucca: fls. nearly 

 as in the group of A. micracantha. Trunkless. 



45. Sch6ttii, Engelm. Cespitose: Ivs. linear-trian- 

 gular, y x 6-12 in., with scarcely grooved spine and 

 few long slender threads: infl. 4-6 ft., slender; fls. some- 

 what curved, yellow, scented as in Polianthes, IJf-tij 

 in.; ovary and segm. J'gin. each, tube J^in. : caps. ^ x 



