July 19, 1913] New Anonaceae 1743 



Discovered in red clay with a gravelly subsoil of wooded 

 river banks at 250 feet altitude. 



Unona aj^usanensis Elm. n. sp. 



Small slender erect tree; stem 14 cm. thick, 7 m. high, 

 only branched toward the top; wood soft, white, a trifle svv^et, 

 odorless; bark smooth, grayish white mottled, green beneatli 

 the epidermis, otherwise of the wood color; main branches 

 divaricately spreading, repeatedly rebranched; twigs green, 

 glabrous or only the young tips finely pubescent, curing 

 blackish. Leaves descending, subraerabranous, equally green 

 on both sides but shining above, turning greenish brown 

 upon drying, glabrous, alternatingly scattered along the 

 younger branchlets, ovately oblong or merely oblong, the 

 entire margins slightly recurved in the dry state, the acute 

 to acuminate apex recurved, base rounded or broadly ob- 

 tuse and frequently a trifle inequilateral, the larger blades 

 15 cm. long by 5.5 cm. wide below the middle; petiole 

 blackish brown, widely caniculate along the upper side, less 

 than 5 mm. long; midrib brown and edged beneath, only 

 shallowly grooved along the upper side; lateral nerves 7 to 

 ^ pairs, ascendingly curved, similar in color and prominence 

 on the nether side, tips obscurely united, also glabrous in 

 the mature leaves, reticulations fine and rather more evi- 

 dent from the upper surface. Flowers pendant, solitary or 2 

 to 3-clustered at the ends of short lateral branchlets; pe- 

 duncle thick, 2.5 cm. long or shorter, brown appressed pu- 

 bescent but becoming nearly glabrous; receptacle of young 

 infrutescence 1 cm. across, flat and circular, roughly pit- 

 ted and short olivaceous pubescent; calyx thick, rigid, with 

 a broad truncate base, yellowish green puberulent on the 

 outside, glabrous on the inner, spreading or reflexed in 

 anthesis, the 3 lobes broadly rounded, 5 mm. long, nearly 

 as broad at the base; petals 6, caducous, ultimately spread- 

 ing and their sides more or less curved upon the dorsal 

 surface, yellow except the greenish base, leathery, elliptic 

 except the narrowed base, glabrous the 3 outer ones 4 mm. 

 long and 2.5 cm. wide at the middle, the 3 inner two thirds 

 as large, veins obscure; receptacle flattened, 7.5 mm. across, 



