ORCHroACEAK 167 



upper ones much reduced. Racemes 5 to 15 cm long, the bracts linear- 

 lanceolate, the lower ones longer than the flowers. Blowers white, showy, 

 the sepals oblong-lanceolate, 12 to 14 cm long. Petals oblong, 6 to 8 mm 

 long. Lip variable, sometimes hastate, sometimes lanceolate, acute, 11 to 

 12 mm long. Spur usually wanting, when present slender and 2 mm long 

 or less. 



In thickets and open grass lands, San Lazaro, Masambong, etc., fl. 

 Oct.-Nov.; widely distributed in the Philippines. Burma and the Malay 

 Peninsula. 



8. H. congesta Ames. 



An erect, glabrous, rather slender terrestrial plant from somewhat fleshy 

 rootstocks, 10 to 20 cm high. Leaves linear, grass-like, up to 11 cm long 

 and 7 mm wide, ascending, acuminate, the lower ones somewhat clasping 

 the stem, the upper ones passing gradually into linear-acuminate bracts. 

 Racemes rather dense, ovoid, 2 to 5 cm long, many-flowered. Flowers 

 Vhite, odorless, the lateral sepals somewhat ovate, acute, 4 mm long, the 

 dorsal one slightly shorter. Petals falcate, shorter than the dorsal sepal. 

 Lip 'S-parted, the lateral lobes linear, 4 mm long, the middle one broader, 

 6 mm long. Spur slender, about 7 mm long. 



On banks of old rice-paddies, Caloocan, very rare, fl. Nov.-Dec; of wide 

 distribution in the Philippines but of very local occurrence. Endemic. 



4. CLEISOSTOMA Blume 



Epiphytic herbs with elongated leafy stems, emitting solitary roots at 

 the nodes, the stems not thickened at the base. Leaves distichous, spread- 

 ing, thick, flat, elongated, the base sheathing the stem. Flowers small, 

 numerous, axillary, in spikes, racemes, or panicles. Sepals somewhat 

 spreading, subequal, the petals similar to the sepals, both adnate to the 

 column, spreading. Lip adnate to the base of the column, the base with a 

 short or elongated spur with a scale or callus at its mouth. Column short, 

 half-rounded, not winged. Anther terminal, 2-celled. Capsules narrow, 

 elongated. (Greek "closed" and "mouth," in allusion to the structure of the 

 spur.) 



Species about 40, tropical Asia to Australia, about 5 in the Philippines. 



1. C. bicolor Lindl. 



An erect or ascending, vine-like epiphyte, quite glabrous, the stem often 2 

 m in lengthj 4 to 7 mm thick, with usually one, long, stout, lateral root 

 at each internode. Leaves thick, nairrowly oblong, 10 to 18 cm long, 2.5 

 to 3.5 cm wide, apex somewhat obliquely retuse, base narrowed, sheathing. 

 Inflorescence lateral, 40 to 80 cm long, long-peduncled, simple or sparingly 

 branched above, the flowers racemosely disposed. Flowers 1.5 to 1.8 cm in 

 diameter, yellow-green with purple spots. Lateral sepals elliptic, about 7 

 mm long, the upper one oblanceolate, obtuse, about 1 cm long. Petals about 

 8 mm long. Apical lobe of the lip orbicular-cordate, acute, fleshy, about 

 2 -mm lojjg, the lateral lobes triangular. 



In shaded ravines, opposite Guadalupe, fl. May- Aug.; widely distributed 

 in the Philippines. Endemic. 



5. DENDROBIUM Swartz 



Slender or coarse, epiphytic plants, the stems often elongated, usually 

 bulbous at the base. liCaves distichous, flat, sessile. Flowers solitary, 

 fascicled, oi' racemose, .sometimes small and insignificant, sometimes large 



