6 SMITHSONIAN MIS< ELLANEOUS COLLECTIONS VOL. 6l 



trigono-ellipsoidea, sat magna, testa Crustacea glabra laevi nitida fus- 

 co-spadicea, arillo dorso depresso, iiule subbilobo scarioso usque ad 

 medium obtecta. Embryo notorrhizus, subcircinato-curvatus ; cotyle- 

 dones crassiusculae, carnosae, amylo farctae cellulisque majoribus 

 saponinigeris persitae, interior transversim subcircinatim biplicata ab 

 exteriore i dorsali i incurva amplexa : radicula a medio seminis dorso 

 intra testae plicam descendens. 



Arbores magnae fructicesve. Rami teretiusculi. thyrsigeri sulcati 

 cortice subfusco laevi, adultiores lenticellis orbicularibus longitudi- 

 naliter vel exacte cruciatim sulcatis ornati. Folia sparsa, exstipulata, 

 abrupte bipinnata, larga, petiolo supra parum subtus magis convexo, 

 rhachi supra bisulcata, sulcis a pinnarum insertionibus decurrentibus, 

 minutim puberula ; pinnae (et ipsae abrupte pinnatae) utrinque 4-9, 

 alternae vel superiores (rarius omnes) suboppositae, oblongae ; foliola 

 ( pinnulae) pinnarum inferiorium et summarum pauciora, utrinque 

 4-7, pinnarum reliquarum 10-12, alterna vel subopposita, sessilia, 

 summa interdum in apicem serratum (quasi foliolum terminale) con- 

 rluentia, proxima quasi decurrentia et rhachin (secundariam) apice 

 marginatum efficientia, ex oblongo-lanceolata vel basi inaequali ( la- 

 tere interiore latiore) in rhomboideum vergentia, acuta et acute ser- 

 rata chartacea, cellulis secretoriis (ut in Tripterodendro et Dilodendro 

 staurenchymatis ampliatis) saponinigeris crebre minutum pellucido- 

 punctata utriculisque seriatis sub nervis instructa, contrita aqua agi- 

 tata mox spumani efficientia, epidermide mucigera. Thyrsi e folio- 

 rum infimorum axillis vel infra folia supra squamaram (perularum) 

 cicatrices enascentes, petiolos aequantes vel subduplo superantes, a 

 medio remote polychasia 4-flora, dichasia 3-flora vel cincinnos 2- 

 floros (apice ad flores singulos reductos) stipitatos 4-10 saepius per 

 paria approximates gerentes ; bractearum vestigia obsoleta. Flores, 

 ut videtur, parvi, feminei longiuscule pedicellati, pedicellis infra 

 medium articulatis. 



Species 2, Costa Rican. 



The new genus Dipterodendron is closely allied to Tripterodendron 

 and nearly intermediate between this and Dilodendron. It agrees 

 with the latter in its bipinnate leaves (papillose underneath in the 

 second species), so that once it seemed to me (See Mart. Flora Bras. 

 XIII, 3, p. 597) that the second species, Dipterodendron elegans, rep- 

 resented by leaves only in the collection of Oersted, must be referred 

 to the genus Dilodendron. The genus Tripterodendron, besides its 

 tripinnate leaves, differs in the entire margin of the disc (though 

 this may be undulated on account of the pressure of the stamens), 



