Dimerandra 



mas. Atwood & 



(AM 



Plantae epiphyticae, erectae; radicibus filiformibus, flexuosis, glabris; cauli- 

 bus erectis, cylindraceis, fractiflexis, foliosis; foliis lanceolatis, rigidis, apice 

 oblique bilobis; inflorescentiis succedaneis, abbreviatis, paucifloris; floribus 

 speciosis, patentibus; sepalo postico ovato-lanceolato, acuto; sepalis laterali- 

 bus ovato-lanceolatis, acutis vel acuminatis; petalis e cuneata basi late rhom- 

 beis, acutis; tabello e cuneata basi obtrapezoideo, antice bilobo, disco 

 multilamellato, in lineis ternis valde approximatis producto; columna cylin- 

 drica, apice bialata; ovario cylindrico, longe pedicellato. 



Epiphytic, caespitose plants, up to 20 cm. tall; roots filiform, flexuous, 



glabrous; stems approximate, cylindrical, from a bulbous base erect, sinuously 



fractiflex, leafy; leaves articulate with the tightly appressed sheaths, lanceolate, 



rigid, conduplicate at base, obliquely bilobed at apex with rounded lobes, up to 



8 cm. long, 1 cm. wide; inflorescences produced in succession, very short, 



few-flowered; bracts ovate-cucullate, concave, acute, up to 3 mm. long; flowers 



produced in succession, 1-3, showy with spreading segments, rose-magenta in 



color; dorsal sepal ovate-lanceolate, acute to acuminate, up to 13 mm. long, 5.2 



mm. wide; lateral sepals obliquely ovate-lanceolate to elliptic-lanceolate, acute 



to subacuminate, up to 14 mm. long, 5 mm. wide; petals from a cuneate base 



broadly rhombic, acute with rounded angles on each side, up to 13 mm. long, 9 



mm. wide; lip slightly adnate to base of column, from a cuneate base obtrape- 



zoid with rounded angles, distinctly bilobed in front provided with a short 



central apicule; disc before the callus prominently cochleate; callus consists of 



3 rows of tightly approximate lamellae confluent in front, on each side with an 



additional tuberculate ridge; whole lip up to 13 mm. long, 13 mm. wide; 



column cylindric terminated by 2 erect, quadrate ears pointed in front, 



rounded dorsally, up to 6 mm. long; pedicellate ovary cylindric, up to 3.5 cm. 

 long. 



Distribution: Guatemala, dept. izabel; Rio Dulce. Hamer 

 A305! Photograph. Nicaragua, prov. chontales; Rio Micca. 

 Heller 7824B (drawing) (SEL!). Costa Rica. prov. san jos£; 

 Puriscal. Alfaro 221 (US!). — prov. guanacaste; Tilaran. 

 Standley & Valerio 44214 (AMES!). Panama, prov. de her- 

 rera; Las Minas. Stern, Eyde & Ayensu 1791 (MO!, US!). 

 Between Canal Zone & Colon. Standley 30302 (AMES!, US!). 

 — prov. Panama; E. of Rio Tecumen. Standley 30448 (AMES!, 

 US!). Chagres. Fendler 332 (AMES!, MO!). — canal zone; 



Standley 29501 (US!). — prov. veraguas; near 

 Bigis and San Juan. Dodge, Steyermark & Allen 16586 



ummit 



(AMES!). Colombia, dept. antioquia. Escobar s.n.! Photo- 

 graph. 



211 



