1961] 



BOTANY OF THE GUAYANA HIGHLANDS PART IV (2) 



13 



acuto, in aristam 6-12 mm longam abrupte producto, ad basim anguste acutis; 

 petiolis 2-4 cm longis, dorsi-ventraliter complanatis, anguste alatis; inflores- 

 centiis cernuis vulgo racemosis 10-15 cm longis, saepe ad basim paniculatis; 

 bracteis primariis integris ovali-ellipticis 15-20 mm longis, 8-10 mm latis, obtu- 

 siusculis, bracteis secondariis et tertiariis late ellipticis vel obovatis ad 8 mm 

 longis ; pedicellis subcrassis, 3-6 mm longis, recurvatis ; calyce quincunciali ; 

 sepalis 5, coriaceis lanceolatis multivenatis, exterioribus acutiusculis, interioribus 

 obtusiusculis 10-13 mm longis; petalis albidis ad basim flavis, oblongo-ellipticis 

 vel oblanceolatis, obtusis, 14—18 mm longis, 5-8 mm latis ; androgynophoro 0.5-1.0 

 mm longo, corona 1-cyclica; staminodiis staminibus alternatis 5, oblanceolatis 

 integris vel ad apicem minute crenulatis, 6-7 mm longis, 1.5-2.0 mm latis, carina 

 ventrali prominenti, appendicibus staminibus oppositis vulgo 10, vulgo 2-3-fidis 

 vel integris, saepe aliquantum laceratis, 2.0-2.5 mm longis; staminibus 5, 

 staminodiis alternatis, ca. 4 mm longis, 4-thecatis, poris subapicalibus lateralibus 

 dehiscentibus ; granis pollinis 3-poris, 20-23 pi diam. ; ovario conico 3-loculari, 

 ovulis numerosis placentis profunde intrusis parietalibus ; stylo simplice integro 

 subulate stigmate terminali ; fructu capsulari conico ca. 14 mm longo, septiei- 

 dali, stylo vulgo deciduo; seminibus elliptico-oblongis 2.5-3.0 mm longis, 1.2-1.3 

 mm latis, rubro-purpureis, unilateraliter et ad apicem conspicue alatis. 



VENEZUELA: Amazonas: Cerro de la Neblina, abundant, exposed ridge, West Escarp- 

 ment Savanna, 8 km west Cumbre Camp; alt. -000 m; virgate slender shrub with nodding 

 reddish glaucous inflorescence, leaves red-edged, petals white basally yellow, stamens cream ; 15 

 Jan 1954, Maguire, Wurdack 4' Bunting 37293 (holotype, NY). Cerro de la Neblina, in 

 1954, Maguire, Wurdack 4' Bunting 37113 (paratype) ; in 1957, Maguire, Wurdack 4" 

 Maguire 42161, 42257, 42286 (paratypes). 



Distribution : known only from Cerro Neblina, where it is a conspicuous 

 virgate shrub 1-2 m high on exposed ridges. In intervale woodland it becomes 

 a small tree reaching a height of 8-10 m. 



Its closest congener is Tyleria spathulata of Cerro Duida, with which it 

 shares similar but non-pendent inflorescences, and leaves similar in general form 

 and venation. 



Tyleria aristata Maguire & Wurdack, sp. nov. Fig. 25F. 



Frutex multum ramosus ad 3 m altum; ramulis tenuibus 1-2 mm diam., 

 nigrescentibus ; foliis plus-minusve confertis, petiolatis; petiolis 3-5 mm longis, 

 planis, ca. 1.5 mm latis; stipulis inaequalibus, dextrorsum anguste lineari- 

 acuminatis ca. 5 mm longis ciliatis aristatis tarde caducis, sinistrorsum 15-20 

 mm longis membranaceis pauciciliatis vel eciliatis aristatis, circum gemmas foliis 

 involutis, mox caducis ; laminis anguste ellipticis vulgo 3-5 cm longis 6-12 mm 

 latis, ad apicem acutis conspicue aristatis, ad basim acutis in petiolo aliquantum 

 decurrentibus ; venis improminulis, ad 65-75° adscendentibus, margine minute 

 serrulato-ciliatis ; floribus solitariis axillaribus, pedicellis 7-9 mm longis; calyce 

 quincunciali ; sepalis 5, lanceolatis acutissimis vulgo 17-20 mm longis ca. 2.5 mm 

 latis, multinervatis ; petalis 5 obovatis vel oblanceolatis, 16-18 mm longis 8-10 

 mm latis ; androgynophoro ca. 1 mm alto, corona 1-cyclica ; staminodiis 5, oblongo- 

 spathulatis 8-9 mm longis, 1.7-2.0 mm latis, carina ventrali conspicue sursum 

 saepe in liberam appendicem a 1 mm longa producta, staminodiis a basim 

 aliquando laceratis, saepe 1-2 mm connatis; staminibus 5, sessilibus, ca. 3 mm 

 longis, ad apicem in appendicem 0.5-0.7 mm longam productis; ovario conico, 

 praecipue 3-loculari, ovulis numerosis, placentis intrusis; stylo subulato 7-8 mm 

 longo. 



