Campbell's Islands.] FLORA ANTARCTICA. 25 



2. CERATELLA, Hook.fil. 



Capitula aggregata, singulo S-10-floro ; floribus exterioribus sub 8, fcemineis, 1-serialibus ; interioribus abortu 

 masculis, omnibus, ut videtur, tubulosis. Involucrum 8-10-phyllum, squamis biserialibus coriaceis subacutis 

 valde inaequalibus, interioribus linearibus 1-3-nerviis angustatis, exterioribus foliaceis latioribus plurinerviis. 

 nen'is omnibus cellulosis pellucidis transverse septatis. Receptaculum nudum, angustum, minutum, planiuscu- 

 lum vel subconicum, foveolatum. Fl. Fcem. Corolla tubulosa, elongata, basi giobosa, ore profunde 4-dentato, 

 dentibus majusculis subinasqualibus oblongis obtusis concavis medio macula oblonga pallida eellulosa pellucida 

 deorsum in lineam extensa. Sty/us validus, exsertus, basi bulbosus, apice breviter bifidus. Achanium com- 

 pressum, tetragonum, anguste tetrapterum, alis membranaceis, oblongo-obovatum, 4-eornutum, comubus bre- 

 vibus divaricatis, 2 exterioribus sublongioribus. Fl. Masc. Corolla tubulosa, lineari-clavata, 3-4-dentata, sub 

 3-4-angulata, angulis pellucidis, dentibus concavis, dorso macula pellucida et linea extensa, ut in fl. fcem. An- 

 thera latiusculae, inclusae, basi breviter biaristata?, apice apiculata?, flavae. Stylus validus, eylindiaceus, corolla 

 i brevior, apice sensim latiore abrupte truncato margine crenato. Achanium obscure 4-gonum, parvuni, 

 vacuum omnino calvum. — Herba pusilla, dense ctespitosa, Androsacis/«ci'e, rupibus prceruptis ad cacumina montium 

 insula Campbell proveniens. Folia alterna, densissime imbricata, stellatim patentia. Capitula aggregata, inter 

 folia summa sessilia. Flores purpurascentes, parvi, inconspicui. 



1. Ceratella rosulata, Hook. fil. (Tab. XVIII.) 



Hab. Campbell's Island; in crevices of rocks at the tops of the mountains, at an elevation of 

 1 400 feet ; very sparingly. 



Caules dense pulvinati, ramosi, duri, rigidi, 1-1^ unc. longi, validi, inferne foliis vetustioribus dense obsiti, 

 fusco-nigrescentes. Folia arete imbricata, stellatim patentia, coriacea vel subcornea, superiora rosulata, basi 

 latiore vaginante scariosa, medio contracta, deinde ovata, acuta, plus minusve concava, subtus striato-nervosa, 

 marginibus acuentibus, superiora gradatim minora, 2-3 lin. longa, intense viridia, aetate fusco-tincta. Capitula 

 in summos ramos 8-10, congesta, brevissime pedunculata, inconspicua, foliis subtensa, 2 lin. longa. Involucri 

 squama irregulariter inserts, ovato-oblongae, subacutae, concavae, nervosa?, nervis (ut in Trineuro) eelluloso-in- 

 crassatis transversim septatis pellucidis, interiores angustiores. Flores parvi, purpurei. 



This plant is perhaps more closely allied to the last genus (Trineuron) than to any other, and exhibits many 

 remarkable points of affinity with it, especially in the pellucid thickened parts of the flower and nerves of the 

 involucral leaves ; likewise the general structure of the capitula, corollas, stamens and styles is much alike in 

 both. But while so many instances of resemblance exist, the totally different nature of the achtsnium becomes 

 the more striking. In the tufted habit, harsh, coriaceous, even horny texture, the plant is more allied to Abro- 

 tanella emarginata. 



These three genera form together a small group, allied in several respects to Hippia, Lessing, but na- 

 turally distinct, all the species of that division being herbaceous, more or less odorous, and often even furnished 

 with pellucid glands. 



The name is derived from the little horn-like processes of the achaenium. 



Plate XVIII. Fig. 1, ahead of capitula ; fig. 2, single capitulum, removed ; fig. 3, receptacle and involucral 

 scales ; fig. 4, a flower of the ray ; fig. 5, the same cut open ; fig. 6, achaenium ; fig. 7, a 3-toothed flower of the 

 disc ; fig. 8, the same, with four teeth ; fig. 9, the same cut open, and fig. 10, a stamen from do. : — all magnified. 



3. LEPTINELLA, Cass. 

 Capitulum go florum, heterogamum ; floribus exterioribus foemineis bi-triserialibus, disci abortu masculis tu- 

 VOL. I. E 



