SCHOMBURGK's GUrANA PLANTS. 125 



foliis ovato-cordatis acuminatis crenatis supra scabro-pubes- 

 centibus subtus tomentoso-pubescentibus triglandulosis sub- 

 aculeatis, umbellis brevissime pedunculatis, tubi staminei 

 lobis sterilibus orbiculatis, antheriferis brevissimis. — Frutex 

 ramis laxis divaricatis. Folia 2 — 3-pollicaria, basi tricostata, 

 glandula oblonga in quaque costa. Petioli 3 — 4 lin, longi. 

 Umbellse petiolo aequilongse. Sepala ovato-lanceolata, extus 

 pubescentia. Tubus stamineus et ungues petalorum breves. 

 Antherae inter lobis sterilibussubsessiles. Petalorum cuculli 

 dilatati, dorso producti in lobum sepalis a?quilongum apice 

 glanduliforme ovatum acutum. Capsula junior echinato- 

 tuberculosa, viiiosa. — British Guiana; Schomburgk, n. 205. 



Gardner's n. 326, from the Organ Mountains; and n. 934, 

 from Pernambuco, both appear to me to be new species of 

 Buttneria. 



660. Ayenia fomentosa, L. — DC. Prodr. v. i. p. 488. — 

 Dry savannahs, Pirara ; Schomburgk, 7j, 744. Bahia; Salz- 

 mann. 



Blanchet's n. 2813, from the Serra Acurua, is very near 

 to the above species, but has the leaves almost smooth on 

 the upper surface; can it be the A. sida-folia, Lceji. — DC. I.e.? 



661. Waltheria involucrata (sp. n.) ; fruticosa, incano- 

 tomentosa, foliis ovato-cordatis acutis dentatis, cymis subses- 

 silibus petiolo brevioribus, bracteolis connatis in involucra 

 inflato-globosa membranacea ore crenata flores binos sessiles 



includentia Frutex elatus. Ramuli tomentoso-pubescentes, 



incani. Folia 2 — 3-poHicaria, utrinque molliter cano-tomen- 

 tosa, petiolo fere poUicari, Involucra in quaque cyma ssepi- 

 us 5 ad 7, florifera 3 lin. diametro, fructifera 4 — 5 lin., basi 

 herbacea, apice membranacea, colorata (alba teste Schom- 

 burgkio), ore parum contracta, irregulariter crenata, extus 

 venosa et cano-tomentosa. Bracteae steriles in cyma paucse, 

 subulatas. Flores intra involucra bina, sessilia, involucro 

 aequilonga. Calyx anguste turbinato-tubulosus, cano-tomen- 

 tosus, striatus, 5-dentatus. Petala cuneato-oblonga, calycem 

 paullo superantia, ungue latiusculo margine undulato, dorso 

 hispido. Staminum tubus brevis ; filamenta petalis subaequi- 



