152 BOTANY 01 THE VOYAGE OF H.M.S. HEKALD. 
574. Baccharis (Trinervatse) rhexioides, H. B. K., Nov. Gen. et Sp. torn. 4. p. 66. no. 49. — De 
Cand. Prodr. torn. 5. p. 399. no. 5. Panamaj in savanas. 
Dr. Seemann gathered both the male and female plant. The leares of the male are somewhat larger, 
and at the summit acute, but not acuminate in ench a elendcr point as in the female plant. Otherwise 
I found no diiference besides the sex of the florets j the involucre is quite the same in both. The two 
original specimens in "Willdenow's Herbarium, no. 15,571 (both sexes), and in Kunth's (the female plant 
onlj), gathered near Montan in the Peruvian Andes, are of a somewhat different habit from those of Dr. 
Seemann, which quite agree with others gathered by Moritz at Caracas, by Otto at La Guaj-ra, by Ehren- 
berg in Mexico, etc., and which are considered by learned botanists as the true Baccharis rhesioideSj 
H. B. K. Humboldt's plant is a stouter one, with thicker and shorter branches and peduncles, and a 
much more remarkable, denser, and tomentose pubescence ; the leaves, in general not differing either in 
size or in shape (being somewhat variable in this respect), have a more light-green hue, with a silvery 
gloss; the inflorescence is a more crowded one, with the flowering branches more leafy; in the flower- 
heads however, the involncral scales, florets and achccnia of the male, as well as of the female plant, I 
observed no essential difference. I do not decide whether our plant is a distinct species, or is a mere 
variety of Saccharis rliexioides, H. B. K., recommending this question to further examination. 
575. Pluchea odorata, Cassini, Diet. 43. p. 3. — Dc Cand. Prodr. torn. 5. p. 452. no. 17. 
Conyza odorata, lAim.— Conyza Carolmensis, AYilld.! Hcrbar. no. 15,625. Panama^ in waste 
places. 
The leaves, in general being quite entire, are often found slightly or repandly toothed in the same 
specimen. 
576. EctiPTA erecta, Linn., De Cand. Prodr. torn. 5. p. 490. no. 1. Panama, in swamps. 
577. Salmea scandens, De Cand. Prodi', torn. 5. p. 493. no. 2.—Bidens scandens, Linn, In 
savanas about Panama. 
Varies with the leaves quite entire or repandly toothed, the teeth having callous tips. Dr. Seemann's 
plant is quite glabrous, and even the uppermost pedicels are very smooth ; but the involucral scales and 
the chaff of the receptacle are somewhat puberulous. The nearly related Salmea Ewpatoria, De Cand., 
however, not only differs from our plant by its dense pubescent branchlcta and pedicels, but also by the 
longer flower-heads being more attenuate at the base, and not so blunt as in Salmea scandens, De Cand. 
and by the corollas and the awns of the acha;nia having twice the length of those in our species. 
Tribus IV. Senecionide^. 
578. jSIilleria quinqueflora, Linn., De Cand. Prodr. torn. 5. p. 503. no. 1. Southern Darien. 
579. Clibadium leiocarpum, Steetz; ramis teretibus molliter villosis, foliis petiolatis tripli- 
nerviis ovato-lanceolatis acuminatis basi attenuatis remote serratis supra scabris subtus pilis adpressis 
pubescentibus paHidioribus, corymbis tricliotomis fastigiatis, involucri squamis glabris margine 
apiceqne ciliatis, achseniis fertilibus glabris, sterilibus apice dense villosis. Volcano of Cbiriqui, 
Veraguas. 
Caules ramique oppositi, graciles, teretes, striati, villosi. Folia opposita, petiolata, petiolo villoso 
2-5-lincari, triplinervia, ovato-lanccolata, basi longiuscule attenuata, margine leviter remote et cal- 
lose serrata, raro aubintegerrima, supra scabra et pills rarls adpressis conspcrsa, subtus pube 
adpressa dense tomentosa, pallidiora, 3-4-pollicaria, 10-16 lineas lata, superiora minora. Corymbi 
