ORCHIDACE.E 



*5. D. pristinum Ames. Flowers white or pale yellow, about 1 cm. long. 

 *6. D. pseudaclinia Lindl. (§ Actinia of Kranzlin's monograph). Sepals, 

 petals, and labellum similar, yellow. Column quadridentate. 



7. D. Ramosii Ames. Flower purplish, 1-1.8 cm. long. 



8. D. secundum Lindl. Flowers purple, racemes one-sided. 



*9. D. topaziacum Ames. Flowers yellow and red, about 1.5 cm. long. 



10. §Oxygenianthe. Stems elongated. Flowers J* cm. in diam- 

 eter, in showy racemes that exceed the leaves. Peduncle itself 

 shorter than the leaves. Leaves distichous, leathery. 



1. D. Dearei Reichb.f. Flowers white, mentum acuminate. 



2. D. Sanderae Rolfe. Flowers white and purple. Labellum below the 

 middle heavily stained or streaked with purple, mentum acuminate. 



3. D. Schuetzei Rolfe. Flowers white, mentum short, obtuse. 



11. § Ceratobium. Stems elongated, stout, leafly, leaves very 



thick, peduncles lateral, elongated, 2 dm. long, produced near the 



summit of the stem, bearing loose racemes of white and purple 



flowers. 



1. D. taurinum Lindl. Flowers ± 5 cm. in diameter on an elongated pe- 

 duncle. 



12. § Distichophyllum. Stem elongated. Leaves thick, dis- 

 tichous, close together along the stem. Flowers very fleshy, whit- 

 ish, solitary, labellum yellowish. Peduncle 3 cm. long,shorter than 

 the leaves, lateral. 



1. D. revolutum Lindl. Flowers hardly equalling the leaves. 



Subgenus RHOPALOBIUM. 



13. §Rhopalanthe. This section is clearly distinguished by 



the pseudobulbous thickening of the basal nodes of the otherwise 



slender stern. The leaves are flat or terete, and the flowers are 



produced along the naked termination of the stems. 



1. D. crumenatum Sw. Leaves 7 cm. long, 1.5 cm. wide. Flowers white 

 or tinged with pink, 4 cm. long. 



*2. D. multiramosum Ames. Leaves linear, about 4 cm. long. Stem much 

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