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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [Vol. 8, No. 4 



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ers 4-merous; in Marling 852, 9 of the 11 examinable flowers were 4-merous. The 

 ovary trichomes of B\ confertum are conic, but the brown glandular tips are obvi- 

 ous on some or all of these hairs. 



32. Brachyotum cogniauxii Wurdack, sp. nov. 



Trichomata minute denseque aspera. Ramuli novelli rotundo-quadrangulati, 

 cum petiolis pedicellisque dense hirsutuli, pilis persistentibus ad 2 mm. longis 

 junioribus pro parte glanduliferis. Petioli 0.5-2 mm. Lamina 5-8(-ll)x 3-4 mm. 

 ovata apice rotundo-acuta basi obtusa, nervis primariis 3 supra anguste impressis 

 subtus expressis, secundariis obsoletis; supra modice brevi-strigosa, pilis graci- 

 libus 6-8/mm. 2 ad 1.5 mm. longis et basi per %-% adhaerentibus; subtus dense 

 laxo-strigosa, pilis 20-25/mm. 2 et ad 2 mm. longis junioribus pro parte glandu- 

 liferis. Flores 4-5 _ meri in ramulis foliatis brevibus solitarii, bracteis 4 aut 6 per- 

 sistentibus conjuncte vestiti. Bracteae exteriores 9-10x7-8 mm. late ovatae 

 apice late acutae vel obtusae, mediae et interiores 11-15 x 9-12 mm. orbiculares 

 vel late ellipticae apice rotundatae vel late obtusae, omnes extus modice laxo- 

 brevi-strigosae 12-20/mm. 2 intus modice strigulosae 10-20/mm. 2 , pilis glandu- 

 liferis glandulis plus minusve persistentibus. Hypanthium 5.5-7x 6-7.5 mm., 

 medio 0.2-0.6 mm. crassum, densissime sericeo-strigosum, pilis 10/mm. 2 glandu- 

 liferis et ad 3 mm. longis. Sepala 7-9.5 x 4-6.5 mm. oblongo-ovata apice late 

 acuta vel anguste obtusa basi per 0.5 mm. cohaerentia intus modice strigulosa 

 pilis 20/mm. 2 glanduliferis. Petala 14-19 x 10-17 mm. apice rotundata, ciliis 

 glanduliferis 0.1-0.3 mm. Filamenta 5-7 mm.; antherae 5*7 mm.; connectivum basi 

 antherae 1.7-2.7 mm., ab anthera per 1-1.8 mm. liberum, lobis ventralibus magnis 

 1.2-2.1 mm. longis singulis 0.3-0.7 mm. latis. Stylus 21-27 x 0.5*0.8 mm., per 3- 

 4 mm. exsertus. Ovarium 5-8 x 3.5-5.5 mm., apice per 3.5-5.5 mm. dense strigu- 

 losum pilis glanduliferis, lobis apicalibus super loculos 0.4-0.8 mm. 



Type Collection and Locality: Pennell 15660 (HOLOTYPE PH); Peru, Dept. 

 Amazonas, "stony jalca, 3500 m. alt., above Colcamar," 24-26 June 1948. "Shrub. 

 Bracts old rose, yellowish-tipped; sepals maize-yellow; petals black." 



Distribution: northern Peru, alt. 2400-3500 m. 



Amazonas: Cerro de Fraijaco northeast of Tambo de Ventilla, Pennell 15843 (PH), 

 Pennell 15877 (PH); Bagazan, Mathews (Fielding) 1255 (BR, K); between Piscohuanuno 

 and Bagazan, Raimondi 1902 (USM); between Almirante and Molinopampa, Sandeman 52 

 (K); Rio Sonche west of Molinopampa, Pennell 15760 (PH); Chachapoyas, Mathews 46H 

 (BR, K). La Libertad: Cajamarquilla, Ferreyra 1267 (NY). 



The flower-mery is quite unstable in B. cogniauxii, with 5 of the collections 

 predominantly 4-merous and 4 predominantly 5-merous; of the 59 examinable flow- 

 ers, 36 were 4-merous. However, the limited number of flowers precluded any con- 

 clusion ^as to the dominant mery. 



This species is abundantly distinct from its nearest relative, B. confertum, 

 with which both Triana and Cogniaux confused it. The densely roughened tri- 

 chomes, spreading stem pubescence, adaxially pubescent and larger bracts and 

 sepals with the hairs gland-tipped, much larger anther tubercles, and smaller api- 

 cal ovary lobes all separate it from its Ecuadorian relative. 



33. Brachyotum trichocalyx Triana, Trans. Linn. Soc. 28: 48. 1871. 

 Trichomes smooth. Branchlets quadrangular, very sparsely strigulose and very 



soon glabrescent except for a few short nodal hairs. Petiole 1-3 mm. Blade 5-7 x 

 3-3.5 mm., ovate with the apex broadly acute to rounded and the base rounded- 

 truncate, the 3 primaries impressed narrowly above and elevated below, the sec- 

 ondaries obsolete; above glabrous; below very sparsely short-strigulose along the 

 veins and glabrous on the surface except for about 4 glandular clusters/mm. 2 

 which turn black with age. Flowers 5-merous, solitary on short leafy lateral 



