1132 



ONCIDIUM 



ONCIDIUM 



late: scape very slender, 6-7 in. long, bearing 2-5 fls., 

 each \Yz in. across: dorsal sepals and petals subequal, 

 lanceolate, pale yellow, blotched with purple-brown; 

 lateral sepals larger, united half-way; labellum large, 

 sulfur-yellow, with a blackish purple callus; lateral 

 lobes small, triangular; middle lobe round-fan-shaped, 

 membranous and undulate. Jan., Feb. Organ Mts., 

 Brazil. B.M. 6494. 



18. c6ncolor, Hook. (O. unguiculdtum, Klotzsch). 

 Pseudobulbs small, oval-oblong, slightly furrowed: Ivs. 

 lanceolate: fls. 1-2 in. in diam., rich yellow, borne on 

 pendulous racemes 1-2 ft. long; lateral lobes united for 

 half their length, smaller than the dorsal sepals and 

 petals, which are obovate; labellum twice as long as 

 the sepals, broad, flat, bilobed, with 2 reddish ridges 

 running down on the base. April-June. Organ Mts. 

 B.M. 3752. I.H. 30:487. R.H. 1881:30. Gn. 13:111. -A 

 plant of close and compact habit, making one of the 

 most attractive yellow coolhouse orchids. 



A. Labellum with a large rent- 



form mid-lobe : latera I 

 lobes small or none. 



B. Petals much broader than the 



EE. 

 F. 



FF. 



FFF. 



FFFF. 



DD. 



DDD. 



E. 

 EE. 

 AA. 



CO. 

 D. 



DD. 

 DDD. 



Petals and sepals nearly of 

 the same size. 



Fls. over 3 in. across: label- 

 lum large, forming the most 

 conspicuous part of the 



flower: panicle stout 21. 



22. 



Fls. medium-sized, numer- 

 ous, in long, climbing pan- 

 icles. 



Sepals and petals linear- 

 lanceolate, acute. 



Fls. white and purple 23. 



Fls. yellow and brown. 



Column wings very truncate: 

 crest of several interrupted 

 ridges 24. 



Column wings rounded , 

 slightly crenulate 25. 



Column wings erose, sphace- 

 late 26. 



Column wings falcate, den- 

 tate 27. 



Sepals lanceolate: petals 

 spatulate 28. 



Sepals and petals linear to 

 oblong, obtuse. 



Color of labellum yellow 29. 



Color of labellum white 30. 



Labellum with the middle 

 lobe variously shaped, 

 rarely reniform, but more 

 so than the lateral lobes, 

 large. 



Fls. rose-colored 31. 



Fls. yellow, variously 

 marked and spotted. 



Crest pulvinate, pubescent. .32. 

 33. 



Crest not pulvinate. 



Apex of labellum deeply 

 2-lobed 34. 



Apex of labellum apiculate, 

 lateral lobes tooth-like 35. 



Apex of labellum merely 

 emarginate, lateral lobes 

 large. 



Middle lobe broadly reni- 

 form, clawed 36. 



Middle lobe not clawed, sepa- 

 rated from the lateral lobes 

 merely by a sharp constric- 

 tion ...37, 



ampliatum 

 excavatum 



tigrinum 

 splendidum 



incurvum 



Baueri 



altissimum 



sphacelatum 



reflexum 



B atemannianum 



Harrisonianum 

 leucochilum 



ornithorhynchum 



divaricatum 

 pulvinatum 



Warneri 

 maculatum 



Limminghii 

 cheirophorum 



long-lanceolate, 9 in. long: inflorescence a large panicle 

 1-3 ft. long, with numerous fls., which are yellow, spotted 

 with red at the bases of the segments; sepals and 

 petals small, the former entirely free; labellum reni- 

 form, spreading, wavy, 1% in. across, narrow at the 

 base, with two small lateral lobes and a prominent lobed 

 crest. March-May. Throughout the coast of Nicaragua. 

 B.R. 20:1699. The flowers are produced in magnificent 

 panicles. In var. majus, Hort., they are half again as 

 large as in the type. F.S. 20:2140. G.C. III. 17:173. 

 Gn. 45, p. 491. G.M. 37:475. 



19. ampliatum, Lindl. Pseudobulbs subrotund, com- 

 pressed, bright green with purple spots, becoming 

 blackish purple and wrinkled with age: Ivs. plane, ob- 



1525. Oncidium tigrinum (O. Barkeri). to show habit. 



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

 Warsz. ) . Pseudobulbs oblong, compressed, 3-5 in. long : 

 Ivs. 1% ft. long, leathery, shining green: panicle 3-5 ft. 

 long, with numerous fls. 1% in. across, yellow, spotted 

 with brown: sepals obovate, obtuse, free; petals oblong, 

 retuse; labellum sessile, with several broken ridges 

 near the base, pandurate, excavated on the under side; 

 middle lobe rotund, emarginate. Autumn. Peru. B.M. 

 5293. I.H. 17:34. Strong plants produce as many as 

 100 flowers on each panicle. 



21. tigrinum, LaLlave & Lex. (O. SdrJceri, Lindl. 

 O. ungiiiculdtum, Lindl.). Fig. 1525. Pseudobulbs 

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

 1 ft. long: panicle erect, stout, 3 ft. high : fls. 2% in. 

 across; sepals and petals similar, lanceolate, undulate, 

 rich reddish brown, with few bars and spots of yellow; 

 labellum yellow, with a very large, orbicular-reniform 

 blade supported on a long claw, lateral lobes oblong. 

 Winter. Mex. I.H. 1:2; 22:221. P.M. 14:97. R.H. 1889, 

 p. 176. Very much like O. splendidum, from which it 

 differs 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 cultivation. 

 Var. grandifldrum, Hort., is advertised. 



22. splendidum, A. Rich. Pseudobulbs small, roiind, 

 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, yellow- 

 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. 51:1121. 

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



23. incurvum, Barker. Pseudobulbs ovate, compressed 

 and ribbed, 2 in. long: Ivs. 9 in. long, ensiform, acute: 

 panicle 2-3 ft. long, slender, much branched and grace- 

 fully arched: fls. 1% in. across, numerous; sepals and 

 petals linear-lanceolate, undulate, white, banded with 

 purple ; labellum 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. Baueri, Lindl. (O. altissimum, Lindl.). Pseudo- 

 bulbs oblong, compressed: Ivs. ensiform, rigid, keeled: 

 panicle with numerous branches and rather dingy fls. : 

 sepals and petals about as long as the labellum, linear- 

 lanceolate, undulate, yellow, with red spots ; labellum 

 with 2 spreading lateral lobes and a reniform emargi- 

 nate mid-lobe, yellow, with a reddish band. Trop. Amer. 

 B.R. 19:1651 (as O. altissimum). A gigantic epiphyte 



