32 BOTANY OF THE VOYAGE OF THE SULPHUR. 
alterna, petiolata, orbiculata, inciso-dentata vel lobata, lobis dentatis, basi late cordata, trinervia, utrinque 
viscosissima ; floralia in ramis corymbi pauca, parva, subsessilia, ovata, dentata. Corymbus oligocephalus, ramis 
dpice monocephalis, inferioribus elongatis. Capitula hemispherica, vix semipollicem diametro, iis Hemizo- 
niarum multiflorarum subsimilia.. Squamee involucri exteriores flores disci subaquantes, margine subscariosee, 
dorso viscoso-pubescentes, interiores fere omnino scariosee, omnes acutiuscule. Corolle radii cirea 20, tubo 
dense glanduloso-hispido, ligula 4 lin, longa apice tridentata, styli ramis glabris. Corolle disci numerose, fere 
ad apicem dense glanduloso-hispide, dentibus 5 brevibus. Styli rami exserti, longi. Acheenia radii et disci 
conformia, nigra, acutangula, ad angulos minute subglanduloso-serrulata, czeterum glabra. 
Although the number of genera of Composite with radiate heads, without 
chaff on the receptacle or pappus to the acheenia, be but very few, this plant does 
not agree with any of them, and the structure of the style being as it were inter- 
mediate between that of the Vernoniacee and of the Senecionidee, it is difficult to 
place it. The general appearance is that of some Asteree, but the lower leaves 
are opposite, and the involucre, flowers, and style are very nearly those of the 
Hemizonia. The receptacle being entirely free from chaff, does not agree with 
the technical character of the Madiee, yet, on the whole, it appears to be amongst 
them, and next to Hemizonia, that the genus should be placed. 
105. Acute millefolium, Linn.—Torr. et Gr. Fl. N. Amer. 2. p. 409.—San Francisco. 
106. Artemisia pachystachya, DC.—Torr. et Gr. Fl. N. Amer. 2. p. 422.—Bodegas. 
Certainly the same as the plant gathered by Douglas, upon which De 
Candolle established his 4. pachystachya. 1 find, however, in these specimens, 
as well as in Douglas’s, more or less of long white hairs on the hermaphrodite 
florets. All the specimens are too young to ascertain whether these florets are 
fertile or not, but they certainly appear to me to be infertile ; and it is matter of 
great doubt whether the species be not referable to the A. pyenocephala (DC. 
Torr. et Gr. l. c. p. 416), gathered by Chamisso in the same locality as Douglas’s 
Specimens. 
107. Artemisia vulgaris, Linn.—Torr. et Gr. Fl, N. Amer. 2. p- 421.—Santa Clara. 
108. Gyaruatium Sprengelii, Hook. et Arn.—Torr. et Gr. Fl. N. Amer. 2. p- 427.—San 
Francisco. } 
109. Gnapuauium palustre, Nutt.—Torr. et Gr. Fl. N. Amer. 2. p- 427.—San Francisco. 
110. Trrxis frutescens, P. Br—DC. Prod. 7. p. 68.—Bay of Macdal i 
: ; Br, : - p. 68.— ena.—A tropical genus, 
of which this appears to be the northern limit. : . te aes 
11. STEPHANOMERTA virgata, sp.n., caule erecto elato virgato paniculato, capitulis secus ramos 
fasciculatis 8-10-floris, achzeniis tuberculoso-rugosis. 
: ales 2S -podales vel altiores, teretes, striati, crassiusculi, glabri, intus cavi, ramulis floriferis numerosis 
Virgatis paniculati. Folia inferiora desunt, superiora linearia vel lineari-lanceolata, apice subulata, acuta, inte- 
- Serrima vel prope basin argute inciso-dentata, glabra. Capitula in ramulis brevissimis 2-3-cephalis secus 
ae pacsiouns Seacioulata, sabecesilia, floribus seepius 10. Involucra 3 lin. longa; squame interiores sepius 5, 
oblongo-lineares, acutiuscule, virides, extus squamellis bracteolisve pluribus brevibus suffulta, Ligule rosew, 
