140 BOTANY OF T^E VOYAGE OF H.M.S. HERALD. 
scentibuSj arachnoideis, exterioribua brcvioribus adprcssisj semilanccolatisj nervo medio crasso per- 
cursis, acutisj intimis longioribuSj lineas 3 aiquantibuSj apicc obtuso patcntibnsj oblongis, scmilineam 
latis. ReceptacuJum nudum, tuberculatum. Corolla glabra, ut in sicco videtur albidaj laciniis 
limbi 5-fidi angustis, gracilibus, acutiusculis, recur^ds, vix tertiam totius corolla partem metientibus. 
Filamenta antlicris duplo fere brc\-iora, media corolla inscrta ; anthercB basi omnino ecaudatse, apice 
appczidicula lanceolata acuta enervi libera auctse, sub autbesi exsertse. Styli rami modice exserti, 
recurvati, aeutiusculi,- longiuscide sed sparse hispidi. Achcenia immatura turbinata, prsetcr callum 
basilarem, pallidum, glabrum, pilis rigidis cinercis ercctis dense hirsuta. Papjms duplex j setts 
utriusque seriei splcndide argenteis, interioribus corolla brevioribus, filiformibus, rigidis, serratis 
supra medium adplanatis, et versus apicem sensim attcnuatis, acutis le^itcrque extrorsum eur\'atis, 
longitudine paullisper inffiqualibus ; setis exteriorihus 3-plo brevioribus, duplo fere latioribus, paleaceis, 
serratis, semilanceolatis, acutis, basi connatis, longitudine latitudineque valde iniequalibus. Volcano 
of Chiriqui, Veraguas. 
This fine species approaclies the Mexican V. ScMedeana, Leasing, of which I have seen an original 
specimen in the Eojal Herbarium at Berlin. Eut Schiede's plant is well distinguished by its leaves being 
more rugose and scabrous on the upper surface, and softlj tomentose on the under, by the cyme being 
more ample, lax, and divergent, and the somewhat larger flower-heads, which give the plant a very different 
habit. The best, and I think more constant difference, however, is found in the scales of the involucre, 
being of a paler dii'ty-grccn colour, the innermost of which are much broader in their middle, often 
exceeding 1^ line, passing into an attenuated hut very obtuse and rounded apex, so that their shape is 
more oval than oblong. The achsenia are more sericeous in V. Schicdeana, but the pappus is quite the 
same iii both species. 
5 10. Centratherum punctatum, Cassini, De Cand, Prodr. torn, 5. p. 70. no. 2. — Ampherephis 
aristata, H. B. K., Nov. Gen. et Sp. tom. 4. p. 32. no. 1. tab. 314. In savanas about Panama. 
Kuuth, 1. c., states the corolla to be glabrous throughout. In the single specimen from Panama I have 
before me, the tube of the corolla is covered with fine liairs, the limb is quite glabrous ; otherwise it 
agrees exactly with an original specimen in Kunth's Herbarium. The stem is fruticose, by which it differs 
from the herbaceous C. intermediimi. Lessimr. 
541. DiALESTA discolor, H. B. K., Nov. Gen. et Sp. tom. 4. p. 44, 45. tab. 320.— Be Cand. 
Prodr. tom. 5. p. 76, 77. 
Var. polychoita, Steetz; pappi palcis 1-6. Volcano of Chiriqui, Veraguas. 
Dr. Sccmanu's plant accords so well with the accurate description and figure of Kunth, 1. c, that it 
may be referred, without any doubt, to this species, though I have not seen an authentic specimen of it. 
The capitula are all two-flowered ; the scales of the involucre, about six in number, are all distichous, just 
as in Kunth's plate, fig. 1 ; but the palese of the achsenia vary in Dr. Sccmaim'a plant from one to six, most of 
them being furnished with five or six, whilst Kunth always found but two, De Candolle, 1. c, one to four. 
Being however most deciduous, as stated by both authors, I should think a character founded on the num- 
ber of them cannot be constant. The allied B. {Oliganthes) macrophyUa and SchomhnrgUi of C. H. Schultz 
Bip. (LinnsBa, tom. 20 (1847) p. 503, 504), of which I have seen original specimens, certainly belong to 
the same genus of Kuuth, but are very tUflerent species, well distinguished by their three- or four-flowered 
capitula, and the involucre, consisting of more, viz. ten to twelve scales, which are disposed in a some- 
what tetrastichous mauner. On the other hand 1 cannot adopt the notion of my friend Dr. Schultz, who 
combined, 1. c, Adenocyclus, Lessing, and Odontoloma, Dialesta, and Fallalesta, II. B. K., into the genus 
