y 
XI—On brand, a New Genus of Begoniaceae. 
By Professor OLIVER, F.R.S., F.L.S., Keeper of the Kew Herbarium. 
(Plate XLVI.) 
Read November 2nd, 1865. 
HILLEBRANDIA, genus novum Begoniacearum. 
Cuar. Gen. Flores monoici. Masculi: Sepala 5. Petala 5, parva, cucullata, sepalis alterna. Stamina 
indefinita, filamentis liberis; antheris oblongis elliptieisve, muticis, rimá marginali dehiscentibus. 
Feminei: Calyx tubo hemisphærico exalato, limbo perigyno 5-partito*. Petala 5, eis fl. ¢ similia, 
perigyna, lobis calycis alterna. Styli 5, distincti, persistentes, lobis calycis oppositi, bifurcati, lobis 
spiraliter stigmatosis. ` Ovarium apice liberum, hians, subuniloculare ; placentis 5, parietalibus, bila- 
| mellatis, utrinque ovuliferis, plus minus basi irregulariter coalitis. Capsula membranacea, vertice 
exserto, foramine lato inter stylos aperta. Semina indefinita, oblongo-obovoidea, exalbuminosa, 
testa areolata ; embryone cotyledonibus brevibus, radicula obtusa.—Herba Sandwicensis habitu 
omnino Begonie: differt floribus petaliferis, placentatione atque capsula apice hiante indehiscente. 
H. SANDWICENSIS, species unica. 
Herba succulenta, ramis sparse pilosulis vel glabratis. Folia petiolo longiora, oblique cordato-rotundata, 
sepius plus minus irregulariter 5—7-9-loba, lobis triangularibus vel rotundatis, acutis vel obtusis, 
inæqualiter serratis, utrinque (subtus precipue ad nervos) pilosulis, 4-8 unc. longa et lata. Pedun- 
culi 4-1-ped., erecti, glabri v. sparsim pilosuli, apice in cymam bisexualem, dichotome paniculatam, 
multiflorem divisi. Bractee membranaceæ, oppositæ, ovato-rotundatæ vel cordatæ, apiculatæ, infe- 
riores 1-3 unc. late.  Fromzsd : Sepala 5, ovata, acutiuscula, exteriora paulo majora. Petala 5, se- 
palis Mess: eisdem multo breviora, spathulata, cucullata, membranacea. Stamina indefinita, libera ; 
filamentis filiformibus ; antheris complanatis, ovato- vel oblongo-ellipticis, muticis, marginelongitudi- 
naliter dehiscentibus. FroxEs Q: bibracteolati. Calyx tubo hemisphærico, ovario adnato, exalato, 
glabro ; limbo perigyno, 5-partito, lobis tubo paulo longioribus vel eodem æquilongis, adscendentibus, 
ovatis, subacutis, longitudinaliter venosis, basi intus glandulis sparsis perigynis capitatis minutis- 
simis (an staminodiis?) instructis. Petala 5, perigyna, calycis lobis alterna, parva, membranacea, 
oblanceolata vel spathulata, concava, circa ? lin. longa. Ovarium 3 inferum, subuniloculare, ut 
videtur tempore florifero apice hians ; placentis 5, bifidis, liberis vel infra irregulariter inter se coalitis, 
utrinque ovuliferis. Styli late bifurcati, lobis erectis spiraliter stigmatosis. Capsula membranacea, 
hemisphærica, ad 1 unc. lata, indehiscens, vertice hians. 
Collected in the island of Maui, Sandwich Islands, by Dr. Hillebrand, and communicated to the late Sir 
W. J. Hooker in July 1865. | 
* For convenience, it may be allowable, in this and similar eases, to speak of the tube and limb of the calyx, 
although organogeny may prove that the former is an axial dilatation, and not a foliar development at all. 
VOL. XXV. 3 E 
