94 PHANEROGAMIA. 



pubescent on the back, the margins more or less scarious, quincuncially 

 imbricated in aestivation, persistent. Corolla hypogynous, or obscurely 

 perigynous, regular, hypocraterimorphous ; the five petals distinct, but 

 connivent for the greater part of their length into a cylindrical tube, 

 the dilated summit, or true lamina, abruptly spreading, slightly pubes- 

 cent externally. They are all alike in size and shape, about 4 lines 

 long, probably white, not appendiculate, linear-spatulate (that is, the 

 connivent claws, if they may be so called, are linear, and the spread- 

 ing lamina ovate), convolutely imbricate in aestivation, in the manner 

 of Violacece generally (that is, with only one petal wholly external and 

 one (the anterior) internal), at length separated by the growth of the 

 fructified ovary, marcescent and persistent, with the calyx, around the 

 base of the ripe capsule. Stamens 5, hypogynous, or obscurely peri- 

 gynous, alternate with the petals, and much shorter than they, longer 

 than the ovary, all similar, entirely distinct and separate, glabrous. 

 Filaments subulate-linear, somewhat flattened, longer than the anthers, 

 entirely distinct, destitute of any dorsal glands or other appendages, 

 not dilated or prolonged at the apex, but bearing the anthers on their 

 summit. Anthers oblong, fixed by the base, introrse; the cells 

 approximate, joined by a narrow connective, longitudinally and some- 

 what introrsely dehiscent, muticous. Pollen-grains simple, spherical. 

 Disk none. Ovary closely sessile, ovoid, glabrous, one-celled, with 3 

 parietal placentae. Style elongated, included in the corolla, some- 

 what curved, filiform, a little club-shaped at the simple apex, which 

 is somewhat gibbous and produced on the lower side, where it is 

 tipped with a minute and simple stigma. Ovules 6, namely, a single 

 pair on the middle of each nerviform placenta, collateral, horizontal, 

 anatropous. Capsule ovoid, coriaceous, about three-seeded, loculi- 

 cidally three-valved ; the persistent style also splitting from the base 

 to the apex into three portions ; the valves conduplicate after dehis- 

 cence, as in Viola, &c. Seeds obovate, smooth ; the testa coriaceous, 

 marked with a slender rhaphe and a broad apical chalaza. Embryo 

 not seen. 



Plate 8. — Isodendrion pyrifolium. Fig. 1. A pair of stipules, 

 persistent on a portion of the stem, enlarged. 2. One of these stipules, 

 detached. 3. Diagram of the flower. 4. A flower with its bractlets, 

 enlarged. 5. One of the petals, enlarged. 6. Stamens and pistil, 

 magnified. 7. Posterior view of a stamen, magnified. 8. Anterior 



