2322 



ODONTOGLOSSUM 



ODONTOGLOSSUM 



appear, as with the native imported pieces. Even the 

 once rare native natural hybrids are now produced, 

 but from the finest types as parents, and sold now at 

 modest prices. It is too much to expect that the cul- 

 tivation of 0. crispum and other coolhouse species will 

 become general until there is certainty of control of 

 temperatures in summer as in winter. Good results 

 have been gained by giving a weak solution of ammo- 

 nium phosphate, two ounces potassium nitrate, three 

 ounces to three gallons of water, using one ounce of this 

 stock solution to each gallon used for the plants. This 

 is known as the "Cookson formula," advocated by a 

 cultivator who noticed that odontoglossums nourished 

 in the vicinity of smoky cities, and it was traced to the 

 deposit of soot on the glass roofs carried by rain-water 

 into the cisterns to be used for the plants. Rain-water 

 is seldom conserved here for watering orchids, but the 

 addition of this slight quantity of fertilizer seems to be 

 beneficial and to take the place of the rain-water. 



E. O. ORPET. 



SYNOPSIS OF SECTIONS. 



A. Fls. yellow, variously spotted with brown, crimson, etc. 

 SECTION I. Ground-color of the labellum yellow... 



Species 1-14 

 SECTION II. Ground-color of the labellum white, 



rarely pale yellow or changing to yellow. Species 15-28 



AA. Fls. white, sometimes shaded with rose or cream, never 



with a bright yellow or greenish yellow ground-color. 

 SECTION III. Plants not dwarf: fls. numerous, in 



branched panicles much exceeding the Ivs 



Species 29-34 



SECTION IV. Plants manifestly of dwarf habit: fls. 

 few, in slender racemes, with the scape (and often 

 the whole infl.) shorter than the Ivs., rarely ex- 

 ceeding them Species 35-44 



AAA. Fls. dark purple. 

 SECTION V. Fls. numerous, small, in large, branched 



panicles Species 45 



SECTION I. 



A. Labellum reniform, larger than the 



rest of the fl 1, Londesbor- 



AA. Labellum oblong or fan-shaped, [oughianum 



shorter than the sepals; apex 

 rounded, emarginate, or acute; 

 margin entire. 

 B. Apex rounded or emarginate. 



c. Sepals sub-rotund 2. brevifolium 



cc. Sepals oblong to lanceolate. 



D. Column with 2 blunt auri- 

 cles. 



E. Fls. marked with red- 

 brown 3. grande 



EE. Fls. marked with darker 



yellow 4. Schlieperi- 



DD. Column with 2 cirrhous [anum 



teeth 5. Insleayi 



6. Coradinei 



BB. Apex acute 7. Lindleyanum 



AAA. Labellum variously shaped, fim- 



briately toothed, and having a [reum 



pectinate crest 8. luteo-purpu- 



9. facetum 



AAAA. Labellum triangular or triangular- 

 oblong, long-acuminate 10. hebraicum 



11. maculatum 



AAAAA. Labellum lanceolate, cordate or has- 

 tate at base. 



B. Column with rhomboid wings. . .12. mirandum 

 BB. Column with 2 subulate awns at 



apex 13. gloriosum 



14. odoratum 



1. Londesboroughianum, Reichb. f. Pseudobulbs 

 roundish ovate, 1-2-1 vd.: raceme 3-6 ft. long, bearing 

 as many as 30 fls.; sepals oblong, undulate, apiculate; 

 petals obtuse, apiculate, wider; both light yellow, with 

 many abrupt, narrow, concentric brown markings; 

 blade of the labellum extending beyond the sepals, over 

 1 in. across, light yellow, with few brown blotches at 

 base. Autumn. Mex. I.H. 30:497. Gn. 16, p. 502. 

 F.M. 1877:246. A distinct plant resembling an oncid- 

 ium. "Var. pardinum, Hort. Lip profusely dotted with 

 brownish crimson. Gn. 16, p. 503. 



2. brevifdlium, Lindl. (0. coronarium, Hort.). Plants 

 with leathery, ovate-oblong, spreading Ivs. and erect 

 racemes, about 1 ft. high, bearing 10-20 fls. 2-2 Y^ in. 

 diam.; sepals subrotund-unguiculate, undulate; petals 

 similar, smaller; labellum smaller than the sepals, 

 cuneate-emarginate, yellow in front, marked about the 

 column with yel- 

 low and purple, with 



a 3-toothed tuber- 

 cle on the base. 

 Colombia. I.H. 21: 

 170. G.C. II. 24: 

 177; III. 18:489; 

 19:79. G.M. 34: 

 819; 38: 127. 



3. griinde, Lindl. 

 BABY ORCHID. Fig. 

 2561 (redrawn from 

 "The Garden"). 

 Pseudobulbs 2-1 vd. : 

 Ivs. broadly lanceo- 

 late: scape few-fld., 

 twice as long as the 

 Ivs.; sepals lanceo- 

 late, the lateral ' 

 ones keeled, yellow, 

 banded with rich 

 reddish brown 

 spots ; petals oblong, 

 broader, obtuse, 

 subundulate, apex 

 yellow; labellum 



almost rotund, apex slightly emarginate, yellow, banded 

 and spotted with rusty blotches, and with a large-lobed 

 tubercle on the claw. Autumn. Guatemala. B.M. 

 3955. F.S. 1:24, 25. P.M. 8:49. Gn. 48, p. 219; 51: 

 118. G.C. III. 17:41 (abnormal fls.); 42:387 A 

 magnificent species with half-drooping racemes a 

 foot long, bearing few large, brilliantly colored fls. 5-6 

 in. diam. 



4. Schlieperianum, Reichb. f. (0. Insleayi var. ma- 

 crdnlhum, Lindl.). Fls. on erect racemes, pale yellow, 

 blotched and barred with deeper yellow mostly on the 



2561. Odontoglossum grande. 



