262 Dr. J. D. Hooker on the Vegetation of the Galapagos Archipelago. 



— 20. Parhinsonia aculeata, L. — 21. Acacia, sp. ? — 22. Piptadenia? sp. — 23. Mimosa asperata, h. — 

 24. Turnera ulmi/olia, L. — 25. Sida rhombifolia, L. — 26. Paritium tiliaceum, St. Hil. 



Alternantheea radicata. Hook. fil. ; radice validd lignosi apice 3-5-cipiti, foliis stellatis recurvis 

 lanuginosis teretibus camosis elongato-linearibus integerrimis obtusis medio supemfe canalicu- 

 latis, ramis floriferis radicalibus abbreviatis lanuginosis apice oligocephalis, capitulis globosis, 

 perianthii foliolis oblongis obtusis emarginatis, antheris 2, stigmate bipartito. 



Hab. Chatham Island, C. Darwin, Esq. 



Radix pro plants maxima, elongata, lignosa, crassitie pollicis, supemfe divisa. Folia perplurima, pa- 

 tenti-recurva, \\-2 unc. longa, teretia. 1 lin. diametr., basi densfe lanuginosa, cetertim arach- 

 noideo-tomentosa. Caules floriferi (seu scapi) foliis breviores, validi, supemfe bracteati, sim- 

 plices V. divisi, plerumque monocephali ; bracteis 3—4, capitulo brevioribus, lanuginosis. Capi- 

 tula alba, ^ lin. lata, multiflora ; floribus compressis lana subscariosa immersis, 1^ lin. longis. 

 Bracteolse floribus paul6 longiores, laterales dorso acutse, postica concava. Perianthii foliola 

 enervia. Tubus stamineus cyathiformis, brevis ; filamentis fertilibus 2, lateralibus, dilatatis, ste- 

 rilibus nuUis. Ovarium orbiculare, compressum. Stigmata brevia. 

 'ITie root of this species is much larger than that of ^. subscaposa, with which it agrees in habit. 



The foliage will distinguish it from that, and from every other described species. — July 1847. 



ERRATA. 



Page 194. No. 105 should be Plantago tomentosa. Lam.} 



— 195. Before No. 114 dele Rubiace>e. 



— 229. Castela Galapageia, //boA. _/J/.=varietas inermis C A'icAo/«on», Hook. The genus should 



be referred to Simarubese. 



