366 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[yol. 9, No. 3 



from riverbanks below the Pakaraima Range in British Guiana and (var. schulte- 

 siana Sandw. 3ot. Mus. Leafl. 17(3):96) from Amazonian Colombia. The collec- 

 tions from the higher altitude^ on Uaipan-tepui 2 seem to me to be a habitat from or 

 variety with more leathery leaflets which tend to be rounded at the apex with an 

 evanescent cusp or acumen. In the same way, as I have written elsewhere, T. 

 roraimae Oliv. and T dura (Bur. & K. Schum) Sprague & Sandw. are probably 

 montane habitat forms or varieties of T. insignis (Miq.) Sandw. 



T. subtilis seems to be closely allied to T. guayacan (Seem.) Hemsl., T. 

 rufescens Johnst. and T. obscwra (Bur. & K. Schum.) Sandw., differing from all of 

 these in the longer hairs along the anterior inner side of the corolla tube, and in 

 the conspicuous and longer bracts of the inflorescence. 



COMPOSITAE 17 



Adenostemma pakaraimae Maguire & Wurdack, sp. nov. 



Herba repens, caule radicante cum petiolis pedunculoque modice breviterque 

 crispulo-puberulo pilis articulatis articulis purpureis; foliis oppositis petiolo 

 8-16 mm longo lamina i.s. membranacea late ovata apice obtusa basi truncata 

 trinervia vel breviter triplinervia nervis supra planis subtus inconspicue eleva- 

 tis, margine conspicue obtuseque serrata dentibus 1-2 mm altis, supra modice 

 puberula pilis albidis articulatis simplicibus vel ramificatis, subtus in venis 

 venulisque brevissime puberula superficie glabra. Inflorescentia monocephala 

 pedunculo 4-10 cm longo subtus saepius cum bracteis duobus oppositis puberulis 

 ovatis 7-15 mm longis praedito, supra cum bracteolis 1-2 saepius alternis line- 

 aribus puberulis; capitulo nutanti, involucri squamis 2-seriatis lineari-ob longis 

 obtusis vel hebeti-acutis, 4-6 x 1-1.5 mm, extus puberulis conspicue crispulo- 

 ciliolatis intus glabris; floribus ca. 13-15; corollae tubo cylindrico (basi leviter 

 expanso) 5.3 mm longo sparse puberulo lobis 5 triangularibus 1.6-1.8 mm longis; 

 antheris 2 mm longis in tubo circum stylum coalitis, filamentis 2 mm longis 

 apice per 0.5 mm incrassatis circa basim corollae insertis; stylo 5 mm longo 

 ramis linearibus 5.5-6 mm longis; pappi setis 4, clavatis, 1 mm longis; achaeniis 

 immaturis 3-5 mm longis ad costas puberulis inter costas sparsissime glandu- 

 losis. 



TYPE: repent succulent herb, occasional on forested slopes of Mt. Ayan- 

 ganna, British Guiana, elev. 1000-1500 m, Feb. 5-6, 1955, Maguire, Bagshaw & 

 Maguire 40578 (NY). 



A. pakaraimae is most closely related to A. verbesina (L.) Kuntze; this Antil- 

 lean and Brazilian species may be differentiated by the glabrous or evanescently 

 puberulous leaves, several -headed inflorescences, glabrous to very obscurely 

 involucral bracts, and more numerously flowered capitula. 



Eupatorium memorabile Maguire & Wurdack, sp. nov. 



Frutex pauciramosus; caulibus vel ramis teretibus robustis juventate dense 

 villosis indumento demum fusco-brunneo tarde glabratis internodiis 1-5 cm 

 longis; foliis oppositis ovatis crasse coriaceis acutis minute apiculatis vel 

 obtusis margine integro anguste recurvato pennivenis jugis 6-8, venis venulisque 

 supra obscure elevatis subtus prominenter elevatis laxe reticulatisque, supra 

 papilloso-scabridis papillis 1-3 in mm quadr. quoque, subtus in venis venulisque 

 villosulis superficie glabris dense (7-9/mm 2 ) glanduloso-punctatisque 6-13 x 3-8 

 cm; petiolo 0.7-2.5 cm longo robusto pubescentia ramorum eadem; corymbo 



17 Several taxa have been contributed by L. Aristeguieta, Inst. Botanico, Caracas, 

 Venezuela, and Senecio phelpsiae by J. Cuatrecasas. 



