126 NATURAL HISTORY OF PLANTS. 
Seeds œ ; embryo exalbuminous; cotyledons thick; radicle near the 
hilum.—Trees ; leaves entire or lobed; flowers polygamous in short 
axillary cymes; cymes sometimes disposed in compound racemes 
(Tropical Africa). See p. 64. 
4. Heritiera Arr.—Flowers nearly of Sferculia, apetalous, 1-sexual ; 
perianth campanulate, 4—5-fid or dentate; staminal column thin, 
dilated at base into an orbicular disk, bearing at apex a few adnate 
annulate anthers often 5-6; cells parallel. Stamens rudimentary or 0 
in female flower. Carpels 4-6, subsessile, alternating with teeth of 
perianth; ovules 1 or 2 in pairs, ascending; micropyle extrorse 
inferior obstructed; styles short, recurved, swollen, stigmatiferous 
at apex. Carpels ligneous or inwardly suberous at maturity, dor- 
sally carinate-subulate indehiscent. Seed 1; embryo exalbuminous ; 
cotyledons very thick; radicle near hilum.—Lepidote trees ; leaves 
alternate, entire, penninerved ; flowers in axillary, sometimes much 
ramified cymiferous racemes (Asta, Oriental and Insular Africa and 
Tropical Australia). See p. 64. 
5. Tetradia R. Br.—Flowers l-sexual or polygamous, 3-4-me- 
rous apetalous (of Sferculia). Stamens 4-w, in simple annulate 
adnate series at summit of column. Carpels 4, o-ovulate; styles 
same in number, recurved stigmatiferous at apex. Fruit ?—A tree; 
leaves simple, subcordate, penninerved ; flowers axillary, solitary or 
shortly racemose (Java). See p. 66. 

II. HELICTEREA. 
6. Helicteres L.—Flowers hermaphrodite ; calyx tubular or ob- 
conical, 5-fid at apex, sometimes unequal, valvate. Corolla (malva- 
ceous) ; petals 5, equal or unequal, elongated into claws at base (all, or 
2, 3) auriculate-appendiculate; præfloration contorted. Stamens 
inserted at summit of column, much elongated, exserted ; 
antherless 5, dentiform ; fertile either 5 alternate or 10 alternating 
in pairs; anthers stipitate or subsessile, extrorse, 2-celled ; cells 
rimose, spreading or confluent. Gynzceum inserted at summit 
of the anther-column, 5-lobed ; ovaries -ovulate ; styles 5, subulate, 
