PRESTONIA.
Char. Corolla hypocrateriformis. Faux coronata tubulo annulari indiviso squamisque 5, interioribus laciniis limbi alternantibus.
Antheræ semi-exsertae, sagittatæ, medio stigtnati cohærentes, lobis posticis polline vacuis.
Ovaria 2. Stylus 1, filiformis, apice dilatato. Stigma turbinatum apiculo angustiore.
Urceolus hypogynus, 1-phyllus.
Folliculi . . . . . .
Habitus. Frutex volubilis, toraentosus. Folia opposita, tomentosa. Corymbi congesti interpetiolares. Calyx [70 foliaceus, laciniis basi intus squamulâ instructis.
Patria. America Meridionalis.
P. tomentosa.
Hab. In sepibus prope Rio de. Janeiro, in Brasilia, detexit Josephus Banks, Baronettus.
Obs. This genus is named in memory of Dr. Charles Preston, the correspondent of Ray, and styled by him, "eruditissimus vir, et curiosissimus stirpium observator." Many of his observations, chiefly on the more minute plants, occur in Ray's "Methodus emendata." Blair also mentions him as an ingenious and expert botanist.
BALFOURIA.
Char. Corolla infundibuliformis. Faux coronata tubulo crenulato. Limbi laciniæ rectæ, æquilateres.
Stamina semi-exserta, fauci inserta. Antheræ sagittatæ, medio stigmati cohærentes, raucronatæ.
Ovarium biloculare. Stylus 1, filiformis, apice dilatato.
Stigma angulatum.
Squamulæ 10, basi calycis extra corollam insertæ: hypogynæ nullæ.
Folliculi . . . . . .
Habitus. Arbor inter minores. Folia opposita, lanceo-
