Asteroidec.] LXXXVIII. COMPOSITAE. 287 
sterilibus ommibus 5. Involucrum nune ovoideum v. oblongum bracteis co-seriatis 
imbricatis siccis exterioribus gradatim minoribus, nunc campanulatum v. rarius hemi- 
sphzericum bracteis pauci- v. 2-seriatis exterioribus parum v. vix brevioribus. Receptacu- 
lum subplanum, nudum foveolatum v. foveolorum marginibus fimbriatis subpaleaceum. 
Corolle .9 filiformes, subtruncats, stylo suo breviores ; regulares, tubuloss, limbo 
campanulato 5-fido. Antherz basi obtusc integre v. vix emarginate. Styli fl. rami 
angusti, fere subulati dorso papillosi v. hirti, rarius in stylum integrum  coaliti. 
Ach:enia fl. ? parva, ssepius compressiuscula, costis 10 prominulis v. secundariis nonnullis 
evanidis paucioribus, pappi setis tenuibus copiosis l—co-seriatis; fl. $ abortiva, pappi 
setis quam in fertilibus scepius "paucioribus 1-seriatis plus minus tortuosis v. fragilibus. 
—Frutices suffruticesve humiles v. elati, rarius subscandentes, nunc glabri glutinosique, 
nunc tomentoso-canescentes v. rarius villosi. Folia alterna v. rarissime subopposita, 
petiolata, sessilia v. decurrentia, ;dissita conferta v. subimbricata, rarius ad squamas 
minutas reducta v. 0, integerrima v. grosse dentata serratave. Capitula parva v. medio- 
cria, in axillis superioribus v. secus ramos sessilia v. in paniculas terminales conferta, 
rarius laxe corymbosa v. ad apices ramorum solitaria. Corolle albse v. rarius flaves- 
centes v.purpurascentes.  Acheznia glabra v. villosula. . 
Species descriptse ad 275, et vix infra 2560 reducend:», omnes Americans, inter tropicos magna 
copia vigentes, nonnulle tamen extratropieze tam boreales quam australes. DC. Prod. v. 398; 
vii. 281.  Walp. Hep. ii. 595; vi. 136; Ann. i. 410; ii. 838; v. 197. Torr. Bot. Whipple Exped. 
46; Bot. Sitgr. Exped. 162. 4. Gray, Bot. Emory Exped. 83, etin Proc. Amer. Acad. v. 193. H. B. 
et K. Nov. Gen. et Sp. iv. t. 322 ad 325. — VaM. Symb. iii. 2. 74. — Jacq. Coll. iii. t. 22 (Chrysocoma). 
Wedd. Chor. And. i. 168, t. 28, 29. Philippi, Fl. Atacam. 30, et in Linnea, xxviii. 738; xxxiii. 145. 
Brongn. in Duperr. Voy. Cog. t. 61, 62. Homb. et Jacquem. Voy. Pol. Sud, t. 26. — Hook. Bot. Misc. 
»- t 94, n Pl. t. 241. Colla in — etd Torin. — -t. 25, bis. 
antheris Aseroideis typicis adiódelis. Species quoad folia y. involucrum in seriebus pluribus ordinandze 
at vix in sectiones distinetas separands. Genera pauca adhue proposita, ad species quarum pappus 
paullulum diversus observatus fuit, nec accurate definienda nec ullo modo servanda videntur. 
SzEneiLUs, Gerín. Fr.ii. 409, 5. 174, est B. scoparia, Pers. pappi florum sterilium setis apice 
inerassatis subpenieillatis, character in pluribus aliis plus minus obvius. 
PixonzaA, Cass. Dict. xli. 57, est B. pingrea, DC., species omnino normalis. 
TunsENIA, Cass. Dici. xxxvii. 480, includit D. sinuatam, et B. hwmifusam, H. B. et K., quarum . 
receptaeuli foveoli margine laceri fere in paleas breves abeunt. Acnymosaccuamrs, Sch. Dip. 
in Walp. Rep. ii. 962, seu 'Baccharides receptaculo paleaceo' verisimiliter ad easdem species 
spectat. 
ARRHENACHNE, Goss; Dict. lii. 253. (SrerzaxANTIUS, Lehm. Ind. Sem. Hort. Hamb. 1826; 18, 
ex eod. in. Nov. Act. Nat. Cur. xiv. 821), est. B. Juncea, Desf., species ramis paucifoliatis capitulis 
majuseulis solitariis latiusculis, ob pappi setas cO-seriatas a Bacckaride separata, character tamen 
in pluribus aliis observatur et setarum copia nequaquam ad sectiones definiendas prodest; habitus 
idem in J. Wrightü, A. Gr. PorxparPus, Less. in Linnea, iv. 314; vi. 149 ; DC. Prod. v. 398, 
species Brasiliensis, pariter capitulis solitariis pappique setis multiseriatis gaudet, sed rami foliati, 
capitula magna, ovoideo lato, braeteis exterioribus ovatis interioribus lanceolatis. 
In Z. discolore, Dc. Prod. vii. 281, pappus miultiserialia, sed involucrum typieum ZaccAaridis. 
Conyza triplinervia, Less. affinesque primo intuitu Baccharidibus nonnullis simillime, ad Conyzam 
tamen referendz sunt'ob capitula androgyna. 
1660. Heterothalamus, Less. in Linnca, v. 145.— Capitula polygamo-dioica, in planta 
submaseula nunc discoidea floribus omnibus 5 sierilibus, nunc radiata floribus radii 9 
l-seriatis fertilibus disci numerosis  sterilibus ; in planta foeminea disciformia, floribus 
omnibus 9 fertilibus. Involucerum ovoideum campanulatum v. hemisph:zericum, brac- 
teis co-seriatis imbricatis lanceolatis linearibusve siccis coriaceisve, exterioribus breviori- 
bus. Receptaculum convexum v. conicum, in planta submascula nudum v. minute fim- 
brillatum, in planta foeminea paleis instructüm involucrum superantibus flores singulos 
semi-includentibus. Corolle 9 tubo filiformi, limbo in ligulam. parvam. nunc minutam 
nune in. radio capituli submaseuli ovatam majoremque expanso ; i regulares, tubulosa, 
