ORCHIDACE^ 



tus nervo medio prominenti, basi valde attenuata in petiolum 



semiteretem sensim decrescentia. Pedunculus cum racemo folio 



paulum longior, plus minusve 34 cm. longus, pergracilis, pro 



parte folio adnatus, usque ad racemum nudus. Racemus plus 



minusve 6 cm. longus, 6 mm. in diametro, distichiflorus, arcua- 



tus, floribus 2 mm. inter se distantibus. Bracteae inflorescentiae 



3 mm. longae, glumaceae, nervosae nervis eminentibus, acutae, 



late ovatae. Pedicellus cum ovario 1 mm. longus. Sepala lateralia 



usque ad 5.5 mm. longa, prope basim 2 mm. lata, triangulari- 



lanceolata, trinervia, apice incrassato-duplicata, breviter cari- 



nata. Sepalum dorsale usque ad 5.5 mm. longum, 1.25 mm. 



latum, oblongum, acuminatum, acutum, trinervium. Petala 



usque ad 4.5 mm. longa, 1.25 mm. lata trans medium, lanceo- 



lata, acuminata, acuta, trinervia. Labellum a basi usque ad 



apicem lobi medii 2 mm. longum, 2 mm. latum trans basim, tri- 



lobatum lobis lateralibus quam lobus medius longioribus ; lobi 



laterales 2 mm. longi, prope medium leviter constricti, basi ro- 



tundati, apice obtusi; lobus medius usque ad 1 mm. longus, 



1 mm. latus prope apicem, quadrato-trulliformis, valde apicula- 



tus, concavus ; discus tricallosus prope basim labelli, callis papil- 



liformibus. Columna incrassata, vix 1 mm. longa, ebrachiata. 



Allied with A. graminifolium Ames and A. linearifolium 



Ames. From A. graminifolium it is separated by differences in 



the inflorescence, by the longer leaves and by the color of the 



flowers, both in dried and living specimens. According to the 



collectors' notes the flowers are red w^hen fresh, and in dried 



specimens they are of a brownish red color. The flowers of 



A. graminifolium are yellowish when alive and in dried material 



are deep brown. A. linearifolium and A.perpleocum are so closely 



alhed that it is difficult to separate them by casual comparison 



based on dried material. The most conspicuous difference is the 



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