198 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN' [VOL. 10 



villosulo, fauce dense et sat longe sulphureo-villosula, lobis ovatis subobtusis vel 

 subacutis 8-9.5 mm longis -4.5-6 mm latis extus paree strigillosis vel subglabris 

 marginibus basi ciliolatis exeeptis intus glabris ; antheris lineari-oblongis apicu- 

 latis basi breviter subsagittatis 2.2-3 mm longis 0.4-0.5 mm latis: stylo breviore 

 quam tnbo vel aequilongo 2.3-12 mm longo glabro ; stigmatibus 0.8-1.5 mm longis ; 

 capsnlis oblongo-turbinatis ab apice septicidaliter dehiseentibns 7-8 mm longis 

 4-5 mm latis strigillosis vel subhirtellis ; seminibus fulvis irregulariter polyedricis 

 1.25-1.8 mm longis 0.7-1 mm latis non alatis minute scrobicnlatis. 



VENEZUELA. Amazonas: right bank of Rio Pacimoni, 50 km above month; 

 frequent in savanna; alt. 100-140 m ; shrub 1-2 m; flowers white; 7 Feb 1954, 

 Maguire, 1 lYurdack, d* Bunting 37592 (holotype NY) ; right bank of Rio Pacimoni, 

 60 km above month ; frequent in savanna ; alt. 100-140 m ; shrub to 3 m ; flowers 

 white; 29 Nov 1953, Maguire, Wurdack, & Hunting 36672 (paratype NY); 

 Sabana Pacimoni on right bank of Rio Pacimoni. 50 km above mouth; locally 

 abundant; alt. 100 m ; shrub 0.5-2 m; flowers white; 2 Oct 1957, Maguire, 

 Wurdack, Keith, & Maguire 41665 (paratype NY) ; Sabana Manacal, Rio 

 Atabapo, 15 km above Guarinumo ; alt. 125 in; shrub 0.7-1 m; flowers white; 

 12 June 1959, Wurdack & Adderley 42972 (paratype NY). 



This species is variable primarily in the amount of its pubescence on the outer 

 surface of the hypanthium, calyx-lobes, and corolla-tube, and, secondarily, in the 

 shape and size of the calyx-lobes, in the length of the style and in acuteness of 

 the corolla-lobes. In most of the material examined, the leaf-blades are quite 

 revolute and the pubescence is dense and more or less abundant on the lower 

 surface of the leaf-blades, and outer surface of hypanthium. calyx-lobes, and 

 corolla-tube. In the collection of IVurdack d* Adderley i2972, however, the hairs 

 are scant or nearly lacking on the lower surface of the blades and outer surface 

 of hypanthium, calyx-lobes, and corolla-tube, and the leaf-blades are less or not 

 at all revolute. 



In anthesis, the calyx-lobes may be relatively short, 3-4.5 mm, and linear- 

 lanceolate to lanceolate, or may be more elongated, especially in post-anthesis 

 and fruit, from 7-10 mm long and oblanceolate to narrowly spatulate-oblong, and 

 varying from acute to obtuse or rounded. In Wurdack & Adderley 42972 the 

 calyx-lobes are more triangular-lanceolate and acute and relatively short. In this 

 collection, likewise, the corolla-lobes are more pointed than in most of the other 

 material examined in this species. 



The style varies from 2.3-6 mm long, included in the lower portion of the 

 corolla-^ube or may equal the length of the corolla-tube. Likewise, the stipule is 

 quite variable, varying on the same branch from an acuminate apex which is 

 entire to a bifid type in which the portions may be close together or widely 

 separated with a shallow groove. Frequently the type with a widely separated 

 bifid apex with a shallow groove is encountered on the uppermost part of the 

 stem below the inflorescence, while those stipules lower down on the branch may 

 be more deeply bifid with a narrower separation or may have a prolonged 

 acuminate uncleft apex. 



The inflorescence of I), re vol ut a is much more contracted and shorter, as well 

 as narrower, than that of D. spigelioides, and presents a more crowded and 

 aggregate type. 



2. Dendrosipanea wurdackii Steyermark, sp. nov. Fig. 72, A-G. 



Frutex 2-4-metralis, ramulis strigillosis ; stipulis triangulari-ovatis acutis vel 

 acuminatis vel medio bifidis 2.5-3 mm longis extus parce strigillosis ; foliis 



