of the Galapagos Archipelago. 209 



Genus Elviras affine. Radix annua. Caulis pedalis, herbaceus, teres, erectus, e basi tricho- 

 tome divisus ; ramis ascendeniibus, pubescentibus. Folia opposita, petiolata, ovata, obtuse 

 duplicato-serrata, coriacea, supra scabriuscula, nitida, subtus pubescentia, nigricantia. 

 Capitula axillaria, densissime congesta, massam depresso-sphcericam ^ unc. latam effor- 

 maniia. Folia involucrantia late ovata, acuminata, hispida. Corollae valde inconspicuce. 



157. Desmocephalum inelegans, Hook.Jil. 

 Hab. Charles Island, Charles Darwin, Esq. 



MiCROCOECIA, n. g. 



Capitula axillaria, pauca, valde compressa, monoica, subtriflora ; floribus foemineis ligulatis, 

 masculis tubulosis. Involucrum compressum, 3-4-foliolatum, foliolo unico late obovato 

 unilaterali, caeteris parvis coUateralibus. Receptaculum minimum, epaleaceum. Corolla 

 fl. foem. tubo gracili ; lamina rotundata, obscure crenata : fl. masc. 4-fida, tubo superne 

 ampliato, segmentis extus barbatis. jlntherce semi-exsertae, ecaudatae. Stylus fl. faem. 

 in ramos 2 elongatos desinens ; fl. masc. indivisus. Achmnium cuneatum, compressum, 

 obscure trigonum, parce pilosum. 



Herba pusilla, repens, scaberula ; ramis gracilibus, ascendeniibus. Folia opposita, petiolata, 

 rigidula, ovata, acuta, serrata, supra hispidula, subtus cana, venis prominulis. Capitula 

 minima, breviter pedicellata. \n\o\\icn foliolum exterius planum, acuminatum, nervosum, 

 marginibus basi involutis. Flores exserti, flavi. 



158. MiCROCOECIA REPENS, Hook.Jll. 

 Hab. James Island, Charles Darwin, Esq. 



A sing-ular little plant, also allied to Elvira and Milleria, but very distinct 

 from both those genera. The stems are about a span long : the leaves \ inch 

 long. 



Macraea, n. g. 



Capitulum multiflorum, heterogamum, radiatum ; floribus radii squamis involucri tectis, pau- 

 cis, 1-seriatis, foemineis ; disci tubulosis. Involucri hemisphaerici squamis sub 2-seriatis, 

 disco brevioribus. Receptaculum convexum, paleaceum ; paleis deciduis flores involu- 

 crantibus. Corollce radii tubo brevi, gracili ; ligula lata bifida : disci tubo 4-fido, den- 

 tium marginibus incrassatis. Antherce breviter appendiculats. Stylus fl. radii in ramos 

 2 obtusos desinens ; fl. disci ramis cono latiusculo terminatis. Achcenium obovato- 

 cuneatum, compressum, trigonum, hispidum, pappo brevi e squamis paucis ciliatis 

 coronatum. 



Genus Heliopsideis relatum. Frutex ramis erectis, virgatis, nodosis. Folia in ramis abbre- 



