116 PROCEEDINGS OF THE AMERICAN ACADEMY 



seriale, squamis inajqualibus angustis appressis. Receptaculum planum, 

 nudum, pi. m. alveolatum. Ligulee parvaj, tubo suo fere semper breviores, 

 nunc exiguse stylo ipso breviores. Corollte disci tubuloste, 4 - S-dentatae. 

 Antheroe Euasterinearum. Styli rami fl. herm. superne elongato-subulati 

 hirtelli. Achenia compressa, striata, vel 4 - 6-costata, vol tantum margi- 

 nato-bicostata lateribus enerviis, apice sjepius contracto, disco epigyno 

 parvo. Pappus simplex, conformis, e setis capillaribus scabris uni - pau- 

 ciserialibus. — Suffrutices vel herbjB OceanicJB, caulibus ramosis ple- 

 rumque foliosissimis, foliis alternis. Capitula aut solitaria ramos termi- 

 nantibus aut corymbosis : ligulaj abae vel purpurea}. 



Vittadinm, A. Rich. Bot. Voy. Astrol. Fl. N. Zel. (1834), p. 250. 

 Tetramolopium, Nees, Ast. (1833), p. 202, pro parte. 

 Vittadinia, Tetramolopium § 1 & Euryhiopsis, DC. Prodr. 



De Candolle's Euryhiojy&is is essentially identical with the older Vit- 

 tadinia of A. Richard, and has been referred to it by Dr. Hooker. 

 The only observed difference is, that the faces of the achenium oi Eiiry- 

 hiopsis macrorhiza, if I rightly identify the plant, are nerveless ; tho.>e 

 of Vittadinia are striate-nerved. There must, however, now be added 

 to the genus several Hawaian species, one of which is strictly an Eury- 

 hiopsis ; another, the type in part of Tetramolopium, Nees, differs only 

 in its less copious uniserial pappus, and in the shorter, mostly four-ribbed 

 achenia ; while others, with corymbose and still smaller heads, have 

 decidedly pluriserial rays, with their more reduced ligules sometimes 

 even shorter than their styles, and the hermaphrodite flowers fewer, — 

 in one instance even reduced to unity, — so that these are to Vittadinia 

 proper what the Conyzoid Erigerons are to Stenactis or to true Eri- 

 geron. The genus, thus augmented, while by its larger-flowered species 

 nearly related to Euryhia (from which De Candollc and Dr. Hooker 

 I'emark that it technically differs only in its compressed achenia), and 

 nearly congruous with the group of ambiguous Asters designated under 

 the name of Orthomeris by Torrey and Gray, is now seen, on the other 

 hand, to be the analogue of Erigeron. From the latter already too 

 polymorphous genus, Vittadinia would be well distinguished by its 

 striate or ribbed achenia, and the slender subulate tips of the styles, 

 except that, unfortunately, some of the species show neither facial ribs 

 nor striaj, while a few species of Erigeron, as Weddell regards them, 

 have long and slender tips to their styles, and some North American 

 ones have four-nerved achenia. The habit generally is not that of 

 E-igeron, and the achenia and the more imbricated involucre will dis- 



