AGAVE 



AGAVE 



237 



fls. 1?2 if- 1 ovary 



sfgni. 5^in., tube 3 sin- E. 



Mex. G.W. 8, p. 337. \\'ith proininpiit and pi-rsistent 

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

 ■imiviUala, Haw. .1. cnsiji-ra, Jacobi ? A. tstniala, 

 Hort.?). Ref. 15ot. 215. B.iM. 6655. G.C. II, 7, p. 368. 

 — Crosses of .1. univittata with A. xylonacantha are re- 

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

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

 writing for the same. 



38. heteracantha, Zucc. Like A. lophaniha 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. lieteracaniha is 

 A. Lecheguilla. 



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

 D. Margin nearly straight. 



39. Kerchovei, Leni. Lvs. triangular, spreading, 

 3-4 X 16-20 in., thick, gray-green, not Uned beneath, 

 with chaimeled 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. 

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

 .4. Kerchovei coarctata, Hort.), with very short lvs.; 

 var. macrodonta, 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 lvs. and slenderer, sparser infl. are 

 A. triangularis, Jacobi (A. Kerchdvei brevifolia, Hort., 

 -■1. h&rrida 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. Roezliana, Baker (A. horrida 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 bv 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 (^4. Gilbeyi longifblia, Hort., A. Ing- 

 hami and .4. Inghanii gigant'ea, Hort.), with broad, 

 often concolorous lvs. and large prickles, known when 

 dwarfed aa var. Gflbeyi (^1. 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. Peacockii 

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

 7757. G.C. 1873, p. 1400, with narrowlj' triangular- 

 lanceolate lvs., sometimes entire. The names Regeliana, 

 Reg'elii and Reg'elii macroddnta, identified by Jacobi with 

 .4. triangularis, seem also to have been appUed to this; 

 and the now unrecognized A. drtichaut, A. h&rrida nana 

 and its f. Isevior and A. hdrrida pygmsea of gardens may 

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

 hybrid of this. 



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

 grdndidens, Hort.? A. grandidenldta, Hort,.? A.frdgilis, 

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

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

 with inrolled spine and moderate prickles joined by a 

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

 typical clear green form varies into an equally large or 

 longer-lvd. form with smaUer, 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. 

 obsciira, Jacobi). A cross of A. fdifera and A. Ghies- 

 brechtii is reported. 



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

 ing, flat, rather thin, about 3 x 12 in., glo.ssy 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 purphsh green, 1% in.; ovary and 

 segm. J4in. each., tube H'm. Cent. Mex. B.M. 6511. 

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

 gmed lvs.: var. Maigretiana (A. Maigrelidna, Jacobi. 

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

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

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

 The names A. DeSmciidna {A. DeSnietliatia, ]a,cobi, 

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

 hdrrida, A. Mdrganii and A. Pilgrimii have been 

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

 foregoing, not now recognized. 



DD. Margin mith prominent fleshy hummocks 

 under the teeth. 



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

 xylinacdntha and xylynacdntha (A. amurensis, Jacobi. 

 A. Kochii, Jacobi. A. Kochii 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: infl. rather slender; fls. \]/2 

 in.; ovary Min., segm. ^in., tube J^gin. 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-hned oblong lvs. with green 

 prominences going into the bases of the large unequal 

 teeth: with altemuita or attenuata subdenlata, chiapensis, 

 densiflorn, filifera (x A. Villanxm, Hort., x A. Villae, 

 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- 

 •nacanlha vittnta and A. xylonacantha hybrida (x A. per- 

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

 527, Verschaffeltii and xalapensis (x A. Pfersdorffii, 

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

 niita or longifblia, the more typical form, latifdlia mac- 

 racdntha, variously spelled, major, Maximilidna, tdrta 

 and Vanderddnckii. 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. Victorije Reginse, 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. IM in- J ovary %in., segm. 

 5^811-, tube 3'sin.: 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.Gard. 7,p. 163. 

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

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

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

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

 cies in having the lvs. 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. Schottii, Engehn. Cespitose: lvs. hnear-trian- 

 gular, }4 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, 1}^-1)^ 

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



