: 40 4 BS tructural dnd Plysiolegical Botany. 
(see p. 202), and the true Atlas] Gum elie is obtained from oa 
Fee ee Bee OS a ee OP a oe Par 9S ee ee ee ee a el 
MS FN eS SIND Cae RRS Nia ge i 6d cat Pak SAE AVL dee car ON ae me Cag 
¢ A reals ty obs AF 345) A } hog thane ery 
) 3408 tyes ae Se of 
ce o 
SSO 
‘e 
Acacia Seyal, ee, and Lhrenbergiana, all natives of tropical Africa ;. ao 
‘terra japonica,’ or catechu, is the sap of Acacia Catechu OF Bengal 
and Coromandel. ‘~y 
Order 2. ROSACEA. The leaves are stipulate ; the calyx eaten and , 
usually gamosepalous and 5-partite, the odd section superior; the co~ 
rolla regular ; the petals distinct, attached to the margin of the calyx, 
and equal in number with itsteeth ; the stamens perigynous, usuallymany 
times the number of the petals, and bent inwards in vernation ; the ovary 
sometimes monocarpellary, but more often multicarpellary, the carpels » 
being either free or coherent with one another and with the calyx ; the 
fruit dry or succulent, a berry, drupe, or a number of achenes or follicles ; 
the seeds exalbuminous. This large and important order is again divided. 
into suborders :— 4 
Pome. (Figs. 518, 519). Trees or shrubs with alternate simple _ 
leaves furnished with free deciduous stipules. The flowers are regularand 
\ 
fee 
: 
“se, 
J N 
Ne" fp 
Fic. 518. — Longitudinal section Fic. 519.— Longitudinal section through an- 
through the flower of the pear apple ; c dry persistent calyx-limb ; E loculi 2, 
(magnified). with cartilaginous pericarp ; T mesocarp 
(reduced). * 
arranged in short terminal umbels, racemes, or cymes, often corymbose ; 
the calyx-limb is 5-cleft or 5-toothed, imbricate in zestivation, and re- ~~ 
maining dry and persistent on the fruit ; the stamens numerous, and, like © Sy 
the five petals, attached in a ring to the base of the calyx (Fig. 518) ; 
the ovary is as a rule 5-, more rarely 2- or 3-locular, each loculus — 
usually containing two ovules ; styles equal in number to the loculi. 
The fruit [or pseudocarp‘(see p. 147)] is succulent, a berry or pome, or ~ 
formed of a number of drupes, the pericarp being thin, cartilaginous, 
or stony. Principal genera :—/Pyrus, Cotoneaster, Crategus, Malus, 
Sorbus, pee Cydonia. | Among edible fruits are the Rohe, bi 
