Mr. J. Miers on the Calyceracez. : 283 
3. Booprts. 
This genus was established in 1803 by Jussieu, upon a plant 
collected by Commerson in the neighbourhood of Buenos Ayres, 
which he named Boopis anthemoides : with this he associated the 
Scabiosa sympaganthera of the ‘Flora Peruviana,’ which was 
afterwards separated and placed in Calycera. Richard, in his 
admirable memoir on the Calyceracee, published in 1820, gave 
ample details of the structure of the genus, then reduced to its 
typical species. To this original type are to be added three 
new species recently described by Dr. Philippi, and three others 
which I now contribute; so that the genus will thus comprise 
seven species. Boopis in many points approaches Acicarpha, 
but it differs from that genus in having a gamophyllous invo- 
lucre in the form of a depressed cup with an incised border, 
quite free from its small globular receptacle, which is not of 
larger diameter than its peduncular support, and which remains 
bristled with the persistent radiating palez after the achznia 
have fallen off: it is also distinguished from that genus by its 
achznia being quite free from each other, and not accreted into a 
cylindrical or spherical mass; and by its calycine lobes, which 
preserve their original form, and do not become enlarged in the 
form of long excrescent subulate spines. It differs from Caly- 
cera in the union of the free leafiets of the involucre into a 
gamophyllous cup, and in its isomorphous achenia, not hetero- 
morphous with the calycine segments often becoming enlarged 
into extremely long spines. 
The genus Acarpha has been proposed by Dr. Grisebach * 
for a Magellanic plant of this family collected by Lechler. It 
obtained this name on account of the supposed absence of palez 
in the receptacle ; but I have examined authentic specimens of 
Techler’s collection in the Museum of Paris, and find very 
distinct palez present in all the capitula, though not accom- 
panying all the florets. Even if this were a distinct genus, 
_ the name would require to be changed; but it appears to me 
a true Boopis, as its involucrum shows; and in the peculiar 
form of its achznia it quite accords with B. multicaulis and 
B. gracilis. 
Boopris, Juss. Char. reformat.—Involucrum gamophyllum, cya- 
thiforme, depressum, submembranaceum, plurinerve, fere ad 
medium 5-10-dentatum, dentibus integris, vel denticulatis, 
lanceolatis, vel 3-angularibus, venoso-reticulatis, rigidulis. 
Receptaculum parvum, convexum, paleolis linearibus, scariosis, 
apice dilatatis, achzniis zequilongis, persistentibus echinatum. 
Flores omnes fertiles et consimiles. Calycis tubus adnatus, 
* Diagn. Pl. Philippi et Lechler, p. 37; Walp. Ann. v. p. 142. 
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