SCHOMBURGlv's GUIANA PLANTS. 245 



old peduncles, in inflorescence also; but the leaves are from 

 five to seven inches loner. 



554. T. sp. ?_A tree of the first size. Juice milky and 

 made into varnish and glue, Scho7nburgk, n. 168.— My speci- 

 mens having no flowers, I do not describe this plant, which 

 has all the appearance of a Taberncemontana. 



555. Plumeria attenuata (sp. n.) ; glabra, ramis vix incras- 

 satis, foliis oblongis basi longe angustatis superne latioribus 

 acumine brevi obtuso, p^mieulae ramis articulatis, bracteis 

 oblongis acutis tubo corollse tenui parum brevioribus, decid- 

 nis. — Ramuli tenuiores quam in casteris speciebus. Folia 

 coriacea 6 — 9 poll, longa, petiolo fere polhcari. Ramipani- 

 culge pauci, alterni, crassiusculi, foliis breviores, interdum 

 bifidi. Bractese 6 — 8 lin. longse. Calyx minimus. Corolla 

 alba, tubo 9 lin. longo tenui sequali ; limbus patens, laciniis 

 obovatis tubo brevioribus. On the Padawire, Scho7nburgk. 



556. Aspidosperma eace/swm (sp. n.) ; foliis petiolalis ellip- 

 ticis obtusis coriaceis supra nitidis subtus incanis, cyma 

 corymbosa densa multiflora. — Arbor excelsa, trunco profunda 

 sulcato, raniulis angulatis, glabris. Folia 4 — 6-pollicaria, 

 venis impressis transversis basi parallelis. Inflorescentia et 

 flores fere J. subincani, Mart., pedicelli tamen, et calyces, 

 rigidiores. FoUiculi compressi, 2 poll, diametro, coriacei, 

 rugosissimi. Semina pauca, cum ala membranacea H poll, 

 diametro. — Yarroura or Hussara of the Indians. The wood 

 is very valuable, and called by tlie colonists Paddkwood. — 

 Flowers yellow. — Sandy soil, British Guiana, Schomburgk, 

 n. 468. 



557. Thyrsanthus Schomburgkii, gen. nov. — On the Rio 

 Quitaro, Schomburgk, n. 556. 



Char. Gen. Thyrsanthus.— Cot/'j/a; 5, partitus, laciniis 

 ovatis, aestivatione imbricatis. Corolla tubo brevissimo, fauce 

 nuda, limbo subrotato profunda 5-fido, laciniis aestivatione 

 lev iter contorto-imbricatis lanceolatis obtusis. Stamina 5, 

 imo corolla inserta. Filamenta brevia, filiformia. AnthevcB 

 introrsae, biloculares, membrana basi bifida apice acuta aucta, 

 circa stigma cohserentes, corolla breviores. Ovarium bilo- 



