ROSACES. 



405 



(figs. 308, 371-373). 3. Spiraeas, calyx-tube herbaceous, lined with a 

 disk, fruit consisting of numerous follicles, seeds apterous. 4. Quillaiege, 

 flowers unisexual, calyx-tube herbaceous, fruit capsular, seeds winged 

 at the apex. 5. Sanguisorbeae, petals 0, tube of calyx thickened and 



600 



indurated, lined with a disk, stamens definite, nut solitary, enclosed in 

 the calycine tube. 6. Pontentilleae, calyx-tube herbaceous, lined with 

 a disk which sometimes becomes fleshy, fruit consisting of numerous 

 achasnia. 7. Rosese, calyx-tube contracted at the mouth, becoming 

 fleshy, lined with a disk, and covering numerous hairy achamia (figs. 

 270, 289). 8. Pomeaj (Pomaceas of Lindley), tube of Calyx more or 

 less globose, ovary fleshy and juicy, lined with a thin disk, fruit a 1-5- 

 celled (fig. 472) or spuriously 10-celled pomum. There are 82 known 

 genera, and about 1000 species. Examples Chrysobalanus, Amyg- 



Figs. 598-605. Organs of fructification of Rubus strigosus, illustrating the natural order 

 Rosaceae. 



Fig. 598. Diagram of the flower, with 5 divisions of the calyx, 5 quincuncial petals, indefinite 

 perigynous stamens, and numerous succulent carpels. 



Fig. 599. The flower cut vertically, c c. Calyx, pe. Petals, e, Stamens, d, Disk, lining 

 the Base of the calyx, upon which the stamens are inserted, pi, Pistil composed of several 

 carpels. 



Fig. 600. Bilocular anther separated with the upper part of the filament, seen on the outside. 



Fig. 601. Ovary, o, cut vertically, g, Exalbuminous, suspended seed, s, Lateral style. 



Fig. 602. Fruit /, Fleshy carpels accompanied with the persistent calyx, c, connected with 

 which the withered filaments are seen. 



Fig. 603. Vertical section of a carpel, a, Lateral style, m, Fleshy mesocarp or sarcocarp. 

 e, Endocarp. g, Seed. 



Fig. 604. Horizontal section of the exalbuminous seed, t, Integument (spermoderm). c, Co- 

 tyledons of the embryo. 



Fig 605. Embryo isolated It fills the entire seed. 



