2;U4 



ONCIDIUM 



ONCIDIUM 



the sepals, broad, flat, bilobeti, with "J reddish ridpes 

 ninning down on tlie base. April -June. Orpan Mts. 

 B.M. 37.%J. I.U. ;?0:-IS7. R.ll. lSSl:;iO. tin. 13:58. 

 Ci. "Jtii^;!?; "JTillW; 35:301. — .\ plant of elose and com- 

 pact habit, making one of the most attractive yellow 

 coolhouse orehids. Var. rhodoptera, llort. Upi)er part 

 of column-wings and margin of stigma red. 



A. Lahdlum with a Itiryf rrniform mid- 

 lohr: laliral lohis small or none. 

 B. Petals much broaiUr than the sepals 19. ampUatum 



20. excavatum 

 BB. Petals and sepals nearly of the same 

 sisr. 

 c. Fts. orer 2 in. across; labellum 

 large, forming the most conspic- 

 uous part of the ft; panicle 



stout 21. tigrinum 



22. splendidum 

 cc. Fls. medium-sized, numerous, in 

 long, climbing panicles. 

 D. Sepals and petals linear- 

 lanceolate, acute. 

 E. Color of /Is. white and purple.23. incurvum 

 EE. Color of fls. yellow and 

 brown. 

 F. Column-winus very trun- 

 cate; crest of sercral in- 

 terrupted ridges 24. Baueri 



FF. Column-wings rounded, 



slightly crrnulalc 25. altissimum 



TFF. Column -wings erase, 



sphacelate 26. sphacelatum 



FFFF. Column-wings falcate, den- 

 tale 27. reflexum 



DD. Sepals lanceolate; petals spatu- 



late 28. Bateman- 



DDD. Sepals and petals linear to |nianum 



oblong, obtuse. 

 E. Color of labclbim yellow. . . .29. Harrison- 



[ianum 



EE. Color of labellum white 30. leucochilum 



AA. Labellum with the middle lobe vari- 

 ously shaped, rarely reniform, but 

 more so than the lateral lobes, large. 



B. ^7^. rose-colored 31. ornithorhyn- 



BB. Fls. yellow, variously marked and [chum 



spotted. 



c. Crest pulvinate, pubescent 32. divaricatum 



33. pulvinatum 

 CC. Crest not pulvinate. 



D. Apex of labellum deeply 2- 



lobed 34. Warneri 



DD. Apex of labellum apiculate, 



lateral lobes tooth-like 35. maculatum 



DDD. A pex of labellum merely emar- 

 ginatc, lateral lobes large. 

 E. Ali^ldle lobe broadly reni- 

 form. clawed 30. Limminghii 



EE. AlifMle lobe not clawed, sepa- 

 rated from the lateral lobes 

 merely by a sharp eonstrie- 

 lion 37. cheirophorum 



19. ampli^tum, Lindl. P.seudobulbs subrotund, com- 

 pressed, bright green with piirjile spots, becoming 

 blaeki.sh purple and wrinkled with age: Ivs. plane, 

 oblong-lanfteolate, 9 in. long: ind. a large panicle 1-3 

 ft. long, with numerous fls., which are y(>llow, spotted 

 with red at the bases of the segms. ; sepals and pet als 

 small, the former entirely free; labellum reniform, spread- 

 ing, wavy, 1 '/2 in. aJTOss, narrow at the b;ise, with 2 small 

 lateral lobc-s and a prominent lohi-d crest. March-May. 

 Throughout the coast of Nicaragua. li.R. I(i99.— The 

 fls. are produced in magnificent panicJes. In var. 

 mAjus, Hort., they are half again as large a-s in the 

 tyi>e. F..S. 20:2140, 2141. G.C. III. 17:173. Gn. 4.5, 

 p. 491. G.M. 37:47.5. C.L.A. 6:160. G. 17:202. J.H. 

 III. .54:29.5. 



20. excavatum, Lindl. (O. aurosum, Reichb. f. & 

 Wanicz.j. I's«Midr)bulbs oblong, compress(!d, .3-5 in. long: 

 IvH. 134 ft. long, leathery, .shining green: panicle .3-5 ft. 

 long, with numerous fl.s. 1)^ in. across, yellow, spotted 



Oncidiuin t 

 num (O. Barkeri 

 show habit. 



«Aa. 



with brown; sepals obovate, obtuse, free; ])etals oblong, 

 retuse; labelhnn sessile, with several broken ridges 

 near the biuse, paudurate, excavated on the under side; 

 midille lobe rotund, eniarginate. Autumn. Peru. B.M. 

 ,5293. I. II. 17:34. — Strong plants produce as many as 

 100 fls. on each panicle. 



21. tigrinum, LaLlave & Lex. (0. Barkeri, Lindl. 

 O. iiiKiiiinilalufii, Lindl.). Fig. 2579. Pseudobulbs oval, 

 compressed, 2-lvd.: Ivs. oblong-lanceolate, thick, 

 1 ft. long: isanicle erect, stout, 3 ft. high; fls. 2J'2 in- 



across; sepals 

 and petals simi- 

 lar, lanceolate, 

 imdulatc, rich 

 reddish brown, 

 with few bars 

 and spots of 

 yellow; labellum 

 yellow, with a 

 very large, or- 

 bicular-reniform 

 blatle supported 

 on a long claw, 

 lateral lobes ob- 

 long. Winter. 

 Mex. I.H. 1:2; 

 22:221. P.M. 14:97. R.H. 1889, p. 176.— Vers^ much 

 like 0. .':plnidi(lum, from which it (liffers by the longer 

 claw of the labellum having a thick keel, and the 

 oblong lateral lobes of the labellum. Both are among 

 the most showy oncidiums in cult. Var. grandiflorum, 

 Hort., is advertised. Var. Crookii, Hort. Sepals and 

 petals marked with light bro\\ii bands. 



22. splendidum, A. Rich. Pseudobidbs small, round, 

 compressed, 1-lvd.: Ivs. leathery, oblong-ovate, 6-12 

 in. long: fl.-stalk erect, 2 ft. long; fls. 3 in. across; sepals 

 and petals similar, lance-oblong, acute, recurved, yel- 

 low-green, with broad brown bands; labellum very large, 

 yellow, the broad claw of the middle lobe expanding 

 into a large reniform blade; lateral lobes small, rotund. 

 Spring. Guatemala and Mex. B.M. 5878 (as O. tigri- 

 num var. splendidum). F.S. 18:1825. Gn. 51:410. 

 R.B. 17:108. G.C. 1871:42; III. 3:108. 



23. incurvum. Barker. P.seudobulbs ovate, com- 

 pres.sed and ribbed, 2 in. long: Ivs. 9 in. long, ensiform, 

 acute: panicle 2-3 ft. long, slender, much branched ancl 

 gracefully arched; fls. 1}^ in. across, numerous; sejials 

 and petals linear-lanceolate, undulate, white, banded 

 with purple; labelhnn white, with a purple blotch; 

 lateral lobes rotund, small; middle lobe subreniform, 

 concave. Bears numerous panicles in autumn. Mex. 

 B.M. 4824. B.R. 31:64. I.H. 2:49; 29:444 (white 

 variety). 



24. Bafieri, Lindl. (0. altissimum, Lindl.). Pseudo- 

 bulbs oblong, compre!3sed: Ivs. ensiform, rigid, keeled: 

 panicle with numerous branches and rather dingy fls.; 

 sepals and petals about a.s long as the labeUum, linear- 

 lanceolate, undulate, yellow, with red spots; labellum 

 with 2 spreading lateral lobes and a reniform eniargi- 

 nate midlobe, yellow, with a reddish band. Trop. Amer. 

 B.R. 1651 (as 0. alti.'isimum). — A gigantic epiphyte 

 with fl.-sts. 6-9 ft. long and "Ivs. as long." It has been 

 confused with O. altissimum. 



25. altissimum, Swartz. Pseudobulbs nearly rotund, 

 mu('h compressed and edged: Ivs. 1-2 at the top and 

 .several at the ba.se of the pseudobulb, ensiform, keeled, 

 l]/2~'2 ft. long: infl., an almost simple, droo]iing raceme, 

 4-6 ft. long; .sepals and petals free, similar, spreading, 

 linear-lanc(!olate, undulate, j)ale yellow, with olive- 

 brown blotches; labellum nearly as long as the jietals, 

 fiddle-shaped, with the middle lolie reniform, .spreading, 

 yellow, with a brown band near the center, prominently 

 crested. Aug. W.Indies. B.M. 2990. B.R. 1851. 



26. sphacelatum, Lindl. P.scudoliulhs elongate-ovate, 

 compressed: Ivs. long, ensiform, apex recurved: scape 



