Field check: Lip obtrapeziform, i.e. wider near base than 

 towards apex. Petals broadly rhombic. 



Observation: Color illustration in American Orchid Society 

 Bulletin 38: 67, 1969, published as Epidendrum stenopetalum 

 Hook, belongs here. Hamer in Icon. PI. Trop. pt. 13: t. 1013A, 

 1985. 



Dimerandra Rimbachii (Schltr.) Schltr. in Fedde, Rep. Beih. 17: 



44, 1922. 



Basionym: Epidendrum Rimbachii Schltr. in Fedde, Rep. 



Beih. 8: 167, 1921. 

 Type: Ecuador, prov. Guayas; near Ventamas. Rimbach 2 



(AMES!). 



Epiphytic, slender plants up to 35 cm. tall; roots filiform, flexuous, glabrous; 

 stems erect, slightly flexuous, leafy above; leaves alternate, oblong-linear, 

 grass-like, obtuse at the obscurely bilobed or retuse at apex, basally articulate 

 with leaf sheaths, up to 11-13 cm. long, 3-4 mm. wide; inflorescence terminal, 

 very short, 1-, 2-flowered; bracts ovate-cucullate, acute, up to 2 mm. long; 

 flowers small, thin, diaphanous, pale rose to lavender, with spreading seg- 

 ments; dorsal sepal narrowly elliptic, acute, up to 11 mm. long, 3.5 mm. wide; 

 lateral sepals obliquely elliptic with a conduplicate, recurved apex, dorsally 

 provided with a prominent, horn-like mucro, up to 11 mm. long, 4 mm. wide; 

 petals oblanceolate-elliptic to subrhombic, acute, up to 13 mm. long, 5 mm. 

 wide; lip from a cuneate base, obovate-flabellate, subserrate-denticulate in 

 front, shallowly emarginate at the apiculate apex; callus at base consists of 3 

 rows of fleshy keel-like ridges free from one another, terminated by a few 

 transverse lamellae; whole lip up to 13 mm. long, 1 1 mm. wide; column cylin- 

 dric, up to 3 mm. long, prominently winged in front, terminated by subrotund 

 apiculate ears which are 1 mm. long, 1 mm. wide; pedicellate ovary cylindric, 

 up to 2 cm. long. 



Distribution: Ecuador, prov. guayas; 12 km. from Guaya- 

 quil. Gilmartin 686 (US!), 715 (US!). — prov. los Rios; Mon- 

 talvo. Holm-Neilsen et al. 2597 (AMES!). Nuevo Zapotal. Mac- 

 Bryde 418 (AMES!, MO!, SEL!). 



Field check: Leaves linear, grass-like. Flowers thin, dia- 

 phanous. Lateral sepals with a prominent, horn-like mucro. Lip 

 serrate-denticulate along anterior margins. 



Dimerandra stenopetala (Hook.) Schltr. in Fedde, Rep. Beih. 

 17:44, 1922. 



tpetalum Hook, in Bot. Mag 



t.3410, 1835. 



212 



