ORCHIDACE^ 



cea instructus, infra racemum bractea vaginanti, plus minusve 



2 cm. longa, acuminata, acuta ornatus. Racemus usque ad 14 cm. 

 longus, multiflorus, laxus, arcuatus, gracilis. Bracteae inflores- 

 centiae elongatae, plus minusve 1 cm. longae, anguste lanceo- 

 latae, valde acuminatae, acutissimae, ovarium aequantes vel ex- 

 cedentes. Pedicellus cum ovario 1 cm. longus, gracilis, oblique 

 ascendens ut videtur. Sepala lateralia plus minusve 1.3 cm. longa, 



3 mm. lata, conspicue quinquenervia, nervis prominentibus, ex- 

 tus nervo medio carinato,spathulato-lanceolata, acuminata, apice 

 conduplicata. Sepalum dorsale 1.4 cm. longum, 2 mm. latum, 

 lineari-oblongum,acutum, prominenter trinervium. Petala usque 

 ad 12 mm. longa, 1 mm. lata supra medium, lineari-spathulata, 

 acutissima, prope basim valde angustata, vix .5 mm. lata, nervo 

 medio prominenti. Labellum 12-13 mm. longum, usque ad 7 

 mm. latum trans medium, valde trilobatum, circuitu hastatum, 

 columnae appressum et cum eo in tubum connatum ; lobi later- 

 ales semiorbiculares, margine denticulati, 4 mm. longi, vix 3 mm. 

 lati ; lobus intermedins primo oblongus deinde triangulus,acutus, 



4 mm. longus, 3 mm. latus trans basim, margine minute denticu- 

 latus vel integer; discus prope apicem columnae conspicue bi- 

 callosus, inter callos breviter carinatus, carina camosa. Columna 

 carnosa, 7 mm. longa, usque ad apicem ungui labelli adnata, in 

 sicco alte bisulcata. 



Closely allied with Epidendrum gracillimum Lehm. & Kranzl. 



vi^hich is much smaller in all its parts, with the lateral lobes of the 



labellum more conspicuously and coarsely dentate. The specific 



name alludes to the deep longitudinal grooves on the back of the 



column which are separated by a rounded rib. 



Colombia, State of Cauca, headwaters of Rio Lopez, Rio Palo basin, 

 Tierra Adentro, H. PittierlOGO, January 1906. Epiphyte, flowers greenish 

 yeUow. 2500-3000 meters altitude. (Type in U. S. Nat. Herb. No. 531282.) 



[ 100] 



