330 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



"[Vol. 9, No. 3 



Unonopsis rigida is closely allied to L. stipitata Diels and like that species 

 is characterized by large rigid leaves and by the occurrence of hairs on the con- 

 nective shields. However, it differs conspicuously in the form of the leaves, 

 which are rounded at the base, not cuneate, by very short and thick petioles, and 

 by thinner and less hairy peduncles. 



Anaxagorea gigantophylla R.E.Fr., sp nov. 



Arbor ad 12 m alta, ramulis novellis crassis densissirne breviterque ferru- 

 gineo-tomentosis; internodia ca. 4 cm longa. Petiolus crassus (7-10 mm diam.) 

 sicut ramuli f errugineo-tomentosus; lamina gigantea, 60-70 cm longa et 20-27 cm 

 lata, rigide membranacea, exsiccata subtus olivacea et pilis stellatis minutis 

 ferrugineis mox evanidis instructa, ovata, basi rotundata et ima basi obliqua, 

 apicem versus sensim angustata et acuta vel ca. 2 cm longe cuspidata; costa 

 supra impressa et glabra, subtus valde elevata, ad 4-5 mm crassa, dense ferru- 

 gineo-tomentosa, demum ± glabrescens; nervi laterales utrinque ca. 25, sursum 

 arcuati et 2-4 mm intra marginem regulariter arcuatim conjuncti, supra impressi, 

 subtus conspicue prominentes. Inflorescentiae vulgo biflorae in ramis efoliatis 

 sitae; pedicelli crassi, ferrugineo-tomentosi, 1-1.5 cm longi, basi bractea minuta 

 et infra calycem bractea altera vaginiformi-amplectenti majore parati. Alabastra 

 subglobosa, obtusa, ca. 1.5 cm diam. Sepala basi breviter coalita, ovata, acuta, 

 mox reflexa, 12-15 mm longa. Petala crassa, extus tomentella, oblonga, apice 

 rotundata, 20 mm longa et 8-10 mm lata, interiora apicem versus intus carinata. 

 Stamina numerosa, ca. 5 mm longa, appendice connectivi semiglobosa glabra; 

 stamina interiora sterilia. Carpella ca. 4 mm longa. Monocarpia ca. 30 mm longa, 

 rugosa, apice apiculo ca. 1 mm longo parata. 



TYPE: VENEZUELA: Territorio de Amazonas: Cerro de la Neblina, Rib Yatua, 

 frequent in rainforest southeast of Base Camp, elev. 140 m, Dec. 14, 1953, 

 Bassett Maguire, John J. Wurdack & George S. Bunting 36774 (NY). 



VENEZUELA: Territorio de Amazonas: Rios Pacimoni- Yatua, Casiquiare, in forest 

 along uppermost Rio Yatua, 100-140 m, Dec. 7-8, 1953, Bassett Maguire, John J. Wurdack 

 & George S. Bunting 36713 (NY and Holm.). 



The new species described here is of particular interest because of its very 

 large leaves. Being from 60-70 cm long and about 25 cm broad, they are actually 

 larger than those of any so far known member of the Annonaceae. Polyalthia 

 dolichophylla and Cremastosperma novogranatense also have large leaves, up to 

 50 cm long and in Guatteria guianensis leaves may be up to 60 cm long. Anaxa- 

 gorea gigantophylla probably holds the long-leaf record in this family. 



^Systematically, this species is most closely related to A. dolichocarpa, with 

 which it agrees in the presence of sterile stamina inside the fertile ones, and in 

 having the same small stellate hairs on the under sides of its leaves. Its gigantic 

 leaf dimensions, and the much more numerous lateral nerves impressed on their 

 upper sides, however, distinguish this new species from A. dolichocarpa. 



Heteropetalum spruceanum R.E.Fr. var. longipetala R.E.Fr., var. nov. 



A typo differt petalis exterioribus linearj-lanceolatis arcuatim recurvatis, 

 1.5-2 cm longis et ca. 9.5 cm latis. 



TYPE: COLOMBIA:- Rio Atabapo, occasional along* drowned river margin 

 between San Fernando de Atabapo and Cacagual, 150 m elevation, 18 Nov., 1953, 

 Bassett Maguire, John J. Wurdack & George S. Bunting 36261 (NY). 



Vernacular name: "Majagua. " 



The genus Heteropetalum belongs to the North Brazilian flora; it is indigenous 

 in the Rio Negro and Rio Casiquiare districts, but also occurs in the adjoining 



