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MEMOIRS OF THE XEW YORK BOTANICAL GARDEN 



[VOL. 10 



Key to the Species of Lorostemon 



1. Sepals 9-11, gradate; peduncles short or essentially lacking, bracteate; leaves 

 obovate to elliptic, 10-15 X 4-6 cm, abruptly acuminate, conduplicate. 

 2. Body of the fruit falcately elliptic, acutish at both ends, ca. 12 cm long, 4 cm 

 broad, pericarp thick, woody, coarsely longitudinally ribbed; stipe 8-10 mm 

 diam; petals 80-105 X 10 mm; anthers ea. 5 per phalange, completely connate; 

 lower Eio Negro. 1. Lorostemon bombaciflorus. 



2. Body of the fruit oblong, broadly obtuse at both ends, 6-7 cm long, 3 cm broad; 

 pericarp baccate, less strongly ribbed, stipe slender, smooth, 5-7 mm diam; Eio 

 Vaupes, Colombia. 2. Lorostemon stipitatus. 



1. Sepals 5, not gradate; peduncles, superior to the bracts, naked, crassate, turbinate; 

 petals 80-90 X 20 mm; leaves oblong-elliptic, 18-22 X 6-7 cm; apex plane, acu- 

 minate, stamens 10-12 per phalange, filaments adnate only below the middle. 



3. Lorostemon colombianus. 



1. Lorostemon bombaciflorus 21 Dueke, Arch. Inst. Biol. Veg. 1 : 210. 1935. 



Type. A. Ducke fruct. 111-1932 (RB) ; florif. 14-6-1933 (cum ligno no. 218), 

 H.J.B.R. no. 23,768 [RB, NY (2) ] . 



I have seen in addition to the types, all from the vicinity of Manaus, the 

 following: Ducke 944, flowering [GH (2), NY] ; Ducke 1200, a specimen with 

 mature fruit (NY). 



Distribution. So far collected only from inundable land near Manaus, Ama- 

 zonas, Brazil. 



2. Lorostemon stipitatus Maguire, sp. nov. Fig. 61 F-G. 



Arbor mediocris latice albo ; ramulis glabris castaneis pauciangulatis, inter- 

 nodiis 3-5 cm longis; foliis oppositis, laminis firme chartaceis vel subcoriaceis, 

 lanceolatis vel oblongo-lanceolatis vulgo 10-13 cm longis, 4-5 cm latis, basi obtusa, 

 apice abrupte conduplicato-acuminato, venis lateralibus, parallelis, prominent- 

 ibus, 1.5-2.5 mm distantibus, obscure in nervo marginali collectivo; floribus 

 sessilibus vel subsessilibus ; bracteis pluribus, ovato-acuminatis ad 5 mm longas ; 

 sepalis 9-11 ovatis, acutis, gradatis, ad 12 mm longos ; corollis et staminibus non 

 visis ; f ructibus baccatis non dehiscentibus, oblongis, 6-7 cm longis, 5-7 cm latis, 

 valde longitudine costatis, pericarpio laevi; stipite tenui, laevi, 6-7 cm longo, 

 4-5 mm diam. ; seminibus 2-3, oblique oblongis, ventraliter compressis, ca. 2.5 cm 

 longis, 2.0 cm latis, castaneis, testa dura, ca. 0.5 mm crassa. 



Tyjye. Medium sized tree with sparse white latex, lower course of Rio Pira- 

 parana (tributary of Rio Apaporis) Vaupes, Colombia, 9 Mar 1952, B. E. 

 Schultes & I. Cabrera 15910 (holotype NY). 



In an earlier paper (I.e.) I referred to this collection, indicating at that time 

 a disinclination to describe it without flowering material. No additional collec- 

 tions have been made, but, in view of a better understanding of Lorostemon and 

 its relatives, it now seems desirable to include this distinct element in the present 

 review of the genus. 



Its closest relative is Lorostemon bombaciflorus, but differs in subtle leaf 

 characters, in longer, narrower acuminate bracts, and chiefly in the fruit. 



2i Ducke treated Lorostemon as a neuter noun, giving the original spelling of the binomial 

 as Lorostemon bombaciflorum. In conformity with generally accepted usage that generic names 

 terminating in stemon (example Penstemon) should be considered masculine, I have adjusted 

 the ending of specific epithets to the masculine form. 



