nature of the flat but free sepaline lobes. Yet I believe that the 
emphasis should be on the dorsally ventricose tube which at 
once separates it from the Section Tubulosae. 
The Section Triotosiphon contains eight species of which six 
are new to science. Surprisingly I have seen no material from 
Colombia or Peru, yet plants have been reported from Ven- 
ezuela, Ecuador and Bolivia. 
Section Triotosiphon (Schltr.) Sweet, comb. nov. 
Basionym: Masdevallia subgen. Triotosiphon Schltr. in 
Fedde, Rep. Beth. 10: 42, 1922. 
Type: Masdevallia Bangii Schltr. 
Small, epiphytic plants, densely caespitose. Roots filiform, 
flexuous, glabrous. Secondary stem very short, completely 
enclosed by tubular, imbricating sheaths. Leaves coriaceous, 
very narrow. Inflorescence very slender, one-flowered. Flow- 
ers rather small, yellow. Sepals connate into a dorsally ventri- 
cose tube, suberect to arcuate, terminated by 3, free lobes; 
lobes fleshy, more or less spreading, ear-like, hence the sec- 
tional name, ecaudate. Petals, lip and column typical for the 
genus. 
KEY TO SPECIES 
Ls. DAP IRtnCty DIODE 0460 brews een aae erage stake ade ev ers sees 2 
Dae TA CRS se gia 5 hares Gy 298 220 eb a 9 bo HR eee oe Sa ea ee 4 
2. Sepaline lobes ovate, obtuse; petals acute; lateral lobes of lip falcate- 
Tia O lato s ps5 547 eee ease sone awe ean ee esse M. trioon 
2a. Sepaline lobes lanceolate to narrowly ovate-lanceolate, acute; petals 
ANCA, IR NIN ssc cao ores char den eee a RE ER ee ERA. 
3. Lateral lobes of lip obliquely triangular, obtuse; terminal lobe of lip 
ovate-rhombic; 3-dentate; disc glabrous ................. M. Bangii 
3a. Lateral lobes of lip semi-elliptic; terminal lobe of lip cuneate- 
subquadrate, erose-denticulate; disc at junction of terminal and lateral 
lobes on each side with an obliquely inserted, semilunate callus ..... 
eee eee ee ee ee ee re wee eer ree er M. Lansbergii 
4. Flowers arcuately curved; sepaline lobes triangular-lanceolate, sub- 
acuminate; petals spathulate; lip with a pair of low ridges ......... | 
4a. Flowers suberect; sepaline lobes ovate-lanceolate to linear-oblong, 
acute to obtuse; petals linear-oblong; lip without ridges ........... 6 
5. Sepaline lobes 8 mm. long; ridges of lip glabrous ... M. kyphonantha 
Sa. Sepaline lobes 4 mm. long; ridges of lip pubescent . M. pseudominuta 
6. Petals linear with a longitudinal, keel-like callus................-. 7 
40) 
