COLLECTED BY MR. SPRUCE. 371 



Prom the forest at the mouth of the Eio Uaupes; a tree of 70 feet, 

 the milk copious, speedily turning black, and staining linen perma- 

 nently ; when dry elastic and very tenacious. T'lowers yellow, sweet- 

 scented. 



7, S. rigidlfolia^ Spruce, MS.; foliolis ellipticis crasso-coriaceis glabris, 

 paniculis pulveraceo-tomentosis, calycibus subacurainatis, antheris 

 5-8 ad basin columnse irregulariter subverticillatis, — Ramuli gla- 

 brati. Foliola breviter petiolulata, 5 poll, longa, %\ poll, lata, acute 

 acuminata, margine recurva, basi cuneata, multo crassiora et rigi- 

 diora quam in cseteris speciebus, subtus punctis crebris albicantia, 

 J?anicul(B pyramidatsB, semipedales, Flores pallide flavi, masculi 2 

 lin., foeminei 3 lin. longi. Jnlherm 8, lutem. Stylus evidentior. 

 A milky tree of 30 feet in height, from the caatingas of the Rio 

 Uaupes, R. Spruce. 



MicEANDRA, gen. nov. Crotonearum, 



Mr, Brown having, as he informs me, ascertained that his Mierandra 

 is a species of SipJionia, that name is now at liberty, and I have applied 

 it to a new genus closely allied to Siphonia, and known on the Eio 

 Uaupes by the same name of Seringue or Xerinyue, but dififering essen- 

 tially in its five free stamens and simple leaves. The capsule also is 

 veiy different from that of the only three species of Siphonia in which 

 it is known. The two species described below are very near to each 

 other, and may, when better known, prove to bamere varieties of one. 

 Char, Gen, Micrandra. Floret monoici, apetali, panicnlati, pedicel- 

 lati, masculi plurirai, foeminei perpauci alares, bracteis minutis. Tl. 

 , Calyx profunde 5-fidus, laciniis valvatis. Stamina 5, sub disco 

 depresso 5-crenato inserta, libera. Fl.foem. Calyx marium laciniis 

 caducissimis. Ovarium disco tenui impositum, ovoideo-conicum, 

 triloculare, ovulis solitariis. Stylus brevissimus, lobis 8 brevissimis 

 latis retusis. — Arbores Brasilienses, foliis alternis petiolatis simplici- 

 bus, paniculis axillarlbus, floribus Inteis. 

 1. M. siphonioides ; foliis amplis elliptico-oblongis, paniculis multifloris 

 petiolo longioribus. — Ardor 50-60-pedalis, truncis fasciculatis usque 

 ad 10 in eadem stirpe, ramis succo lacteo abunde scatentibus, tota 

 glabra exceptis ramulis novellis et inflorescentiis pulveraceo-puberulis. 

 Folia longe petiolata; lamina S-'ll poll, longa, 4-5 poll, lata, bre- 

 viter acuminata, basi obtusa, membranacea, penninervis et transver- 



