334 PROCEEDINGS OF THE AMERICAN ACADEMY 



Alstonia, R. Br., subgen. Dissuraspermtjm. Semina undique 

 Eequaliter et creberrime ciliato-plumosa, hand vero comosa, basi api- 

 ceque in acumen vel caudam producta, cauda superiori apice bifida : 

 albumen tenuissimum. Corollfe lobi lineari-lanceolati, aistivatione si- 

 nistrorsum (sensu Candollii) convoluti : faux barbata. — Frutices vel 

 arbusculje insularum, foliis oppositis, petiolis angustissime marginatis 

 basi pi. m. dilatatis, cymis patentibus. 



A. (Dissuraspermum) costata, R. Br. (Echites, Forst.) Soci- 

 ety Islands. Brown's doubt whether the cilia which fringe the seeds 

 were elongated at the base and apex into a coma, evinced his usual 

 caution. In fact, the seeds are not properly comose at all, but equably 

 ciliate-fringed all round, the tails short, flat, and equally fringed with 

 the rest of the margin, the lower one entire and rather blunt, the upper 

 notched or bifid. The rudiments of one or both of these tails are to 

 be seen in A. ophioxyloides, F. Miill., in which the hairs extend both 

 ways into a coma. Forster's description of the seeds " margine cylin- 

 drica " is, I presume, a lapsus for " margine ciliata." 



A. (Dissuraspermum) plumosa, Labill., to which must belong 

 our specimens from the Samoan and Feejee Islands, is more closely 

 related to the foregoing than would be inferred from Labillardiere's 

 plate, as that does not well represent the stigma (indusiate-appendaged 

 below, and with sharper lobes above), nor the calyx, which is five- 

 parted to the base. But the seeds are not badly figured, except that 

 the long tails are flat in our specimens, rather than exactly filiform. 

 These two species might be wholly detached from Alstonia with better 

 reason than Blaheropus has been. 



Asclepiadacece. 



Tylophora Samoensis (sp. nov.) : herbacea, volubilis, fere glabra ; 

 foliis cordatis acuminatis raembranaceis ; pedunculis filiformibus peti- 

 olo apice glandulifero longioribus ; umbellis plurifloris ; corollis vires- 

 centibus ; coronse stamineae foliolis subcarnosis lineari-oblongis apice 

 acutiusculo antheras adtequante tantum a gynostegio liberis ; polliniis 

 obovato-oblongis adscendentibus brevissime stipitatis. — Savaii, one of 

 the Samoan Islands. Follicles 6 inches long, slender, smooth. 



Ttlophola Brackenridgei (sp. nov.) : volubilis, glabrum ; foliis 

 ovatis subcordatis mucronatis ; pedunculis petiolum apice baud glandu- 

 liferum subtequantibus ; umbellulis plurifloris ; floribus carneis undique 

 glabris ; corona staminea e glandulis seu gibberibus carnosis lateraliter 



