ORCHIDACEiE 



surus stenocentron Sckltr. in Fedde Repert. Beihefte 9 (1921) 60. 



Erythrodes stictophyWa. {Schltr.) Ames comb. wou. Physurus 

 stictophyllus Schltr. in Fedde Repert. 10 (1911) 249. 



In the representatives of this species found in herbaria a sur- 

 prising range of variation in size is to be observed, some of the 

 more robust specimens resembhng very closely E. Tuerckheimii 

 (Schltr.) Ames. The smaller flo vipers and the erect flattened pa- 

 pillae at the base of the sac are differentiating characters. I have 

 been unable to detect in the flowers of ^. Tuerckheimii any trace 

 of calli at the base of the sac and the lateral ones are wanting 

 or obscure. Apparently a close ally of ^. loxoglottis (Reichb. f ) 

 Ames, which is similar in habit to some of the smaller speci- 

 mens observed. 



Erythrodes tridax {Reichb. f.) Ames comb. nov. Physurus 

 tridax Reichb. f. Beitr. Orch. Centr. Am. (1866) 64; Xen. Orch. 

 2 (1874) 182, t. 178, f. II. 



Erythrodes trinitatis Ames sp. nov. Afl". E. querceticolae et 



E. vaginatae. Herba terrestris, erecta, plus minusve 9 cm. alta, 



glabra, rhizomate decumbenti, cauliformi. Folia approximata, 



variegata, lamina 1-2 cm. longa, usque ad 11 mm. lata, ovato- 



lanceolata, acuminata, acuta. Petiolus plus minusve 1 cm. longus, 



infra medium laxe vaginans, supra medium contractus. Racemus 



plus minusve 2 cm. longus, densiflorus, glaber. Bracteae inflo- 



rescentiae usque ad 6 mm. longae, scariosae, ovato-lanceolatae, 



uninerviae, acuminatae, acutae. Flores plus minusve 4 mm. 



longi, albidi, mediocres. Sepala lateralia 4 mm. longa, 1.75 mm. 



lata, elliptico-oblonga, apice leviter cucullata, subobtusa, glabra. 



Sepalum dorsale 4 mm. longum, extus leviter carinatum, prope 



apicem minute papillosum. Petala 3.5 mm. longa, 1 mm. lata 



supra medium, inaequaliter spathulata, obtusa, uninervia. Label- 



lum 3.5 mm. longum, saccatum, lobo terminali trilobulato, 2 mm. 



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