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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [Vol. 9, No. 3 



virgatus, has been found on more than one mountain. Six species occur on the 

 Chimanta Massif, three on Cerro Sipapo, two each on the Cerro de la Neblina, 

 Cerro Guaiquinima, Serranfa Yutaje, and Cerro Huachamacari, and one each on 

 Cerro Duida, Serranfa Paru, Apacara-tepul, and Churi-tepul. 



Key to species of Myriocladus 5 



Blades not more than 17 mm long, 2 mm wide, appressed; inflorescence simple, 

 bearing 3-5 spikelets, usually partly enclosed in the sheath. 

 Rachilla pilose, the segment above the sterile lemma 1 mm long; internodes be- 

 low the branches relatively short, mostly 3-4 cm long. 1. M. gracilis. 

 Rachilla glabrous, the segment above the sterile lemma 0.5 mm long; internodes 



below the branches elongate, 8-12 cm long. 2. M. s tey ermarkii. 



Blades very much larger; inflorescence with few to numerous racemes. 



Blades narrowly lanceolate, the base nearly as wide as the mouth of the sheath; 

 glumes distinctly awned. 

 Racemes 2-2.5 cm long; awns of the glumes about as long as the spikelet. 



3. M. virgatus. 



Racemes not more than 1 cm long; awns of the glumes much longer than the 



spikelet. 4. M. maguirei. 



Blades broadly rounded, the base usually petiole-like, much narrower than the 

 mouth of the sheath; glumes awnless or short-awned (except in M. cardonae 

 with spike-like inflorescence). 

 Racemes few, usually less than 10. 



Panicles dense, 6-8 cm long; fertile lemmas acuminate, the first 8-10 mm 



long. 5.M. neblinaensis. 



Panicles open, 10-20 cm long, with slender, distant, ascending to spread- 

 ing branches. 



Culms very slender, 45 cm to 3 m high; blades 5*7 cm long, 5-10 mm 



wide. 6. M. simplex. 



Culms relatively coarse, as much as 4 m high; blades 10-11.5 cm long, 



about 2 cm wide. 7. M. exsertus. 



Racemes numerous, usually many more than 50. 



Inflorescence dense, spikelike, about 1 cm wide, the branches very short, 



appressed. - 8. M. cardonae. 



Inflorescence open, the branches ascending to spreading. 



Panicles lax, the branches very slender, at least some of them more 

 than 10 cm long. 



Axis and branches of panicle glabrous, glandular-spotted; fertile floret 



4.4 mm long; spikelets glabrous. 9. M. longiramus. 



Axis and branches of panicle usually densely pubescent; fertile floret 

 not more than 4.3 mm long, usually less; glumes and lemmas 

 distinctly hispidulous at the summit. 

 Spikelets with 1 fertile floret, purple; lemmas obtuse or subobtuse. 



10. M. a f finis. 



Spikelets usually with 2 fertile florets; lemmas acute or subacute. 



1 1« M. paruensis. 



Panicles rigid, erect, the branches stiffly ascending or spreading. 

 Panicle-branches densely flowered to the base, simple. 



Glumes, at least the second, distinctly awned; blades of fertile 



culms 26 cm long, 12 cm wide. 12. M. grandifolius. 



Glumes awnless; blades of fertile culms 9-12 cm long, 6 cm wide. 



13. At paraquensis. 

 Panicle-branches naked at the base or at least the lower ones bearing 

 short, usually divergent branchlets. 

 Spikelets distant, long-pedicellate, mostly 2-4 on each branch. 



14. M.' variabilis. 



Spikelets approximate, short-pedicellate, appressed, usually more 

 than 4 on each branch. 



s Not all treated in this report; some are listed in "Botany of the Chimanta Massif" 

 (Mem. N.Y. Bot. Gard. 9:393-439- 1957). 



