950 ARBORETUM AND FRUT1CETUM. PART II J . 



App. i. Other Sorts of Myricdria not yet introduced. 



M. squamosa Desv., Ann. Sc. Nat, 4. p. 850., Don's Mill., 2. p. 728., is probably only a variety of 

 M. dahurica. 



M. longifolia Dec, Don's Mill., 2. p. 728. ; Tamarix germanica Pall. ; T. decandra Pall. ; T. 

 loogifblia IVilhl., M. linearifolia Desv.) is a native of Siberia, at the Baikal, in saltish places. 

 There are two forms of it described bv Ehrenberg, in the Linncea. It grows to the height of 5 ft. or 

 6 ft. 



M. kerbdcea Desv., Tamarix gerrminica subherbacea Pall., appears to be a variety of M. ger- 

 manica, as are, probably, all the other sorts above mentioned. The leaves and young shoots of this 

 sort are used by the Mongolians as tea, and are administered by the priests of Tibet as medicine. 



M. bracttdta Royle lllust., p. 214. t. 44., is found in the vicinity of Cashmere. 



M. ilegans Royle, 1. c, is found at Lippa and Kunawar, where the climate resembles that of Tar- 

 tary, and the soil is saline. 



Both these Nepal species will probably prove hardy in Britain, when introduced. 



CHAP. XLVIII. 



OF THE HARDY LIGNEOUS PLANTS OF THE ORDER PHILADEL- 



PHA v CEiE. 



The hardy ligneous genera of this order are only two, and their charac- 

 teristics may be taken together, as representing those of the order. 



Philade'lphus L. Calyx with an obovate top-shaped tube that adheres to 

 the ovary : the limb is in 4 — 5 parts. Petals 4 — 5, in aestivation convo- 

 lutely imbricate. Stamens 20 — 40, inserted into the throat of the calyx, 

 in 1 — 2 series, shorter than the petals ; the filaments distinct. Styles 4 — 5, 

 in some instances connate, in others more or less distinct. Stigmas 4 — 5, 

 oblong or linear, in most instances distinct, in a few connate. Capsule half 

 adnate to the calyx, of 4 — 5 cells, and enclosing many seeds. Seeds resem- 

 bling sawdust ; individually awl-shaped, smooth, and included in an oblong, 

 lax, membranous aril, that in some instances is fringed : they are grouped 

 upon an angular placenta, in the angles of the cells. Albumen fleshy. Em- 

 bryo inverted, almost as long as the albumen. Cotyledons oval-obtuse, 

 flattish. Radicle rather taper, longer than the cotyledons, straight, obtuse. 

 Shrubs or undershrubs, from the temperate regions of the northern hemi- 

 sphere, and some of them from Western Asia. Leaves opposite, nerved, 

 dentate or almost entire. Flowers white, pediceled upon axillary or ter- 

 minal peduncles, that are branched in a trichotomously cymose, or in a 

 somewhat panicled, manner, bracteated. (Dec. Prod., in. p. 205.) 



Decuma n ria L. Calyx with its tube bell-shaped; its limb with 7 — 10 teeth. 

 Petals as many as the teeth of the calyx, alternate with them, oblong. 

 Stamens thrice as many as the petals, 2 in front of every petal, 1 between 

 every 2 petals, all in 1 whorl. Style 1, very thick, expanded at the tip into 

 a disk that bears 7 — 10 radiating stigmas. Capsule of egg-like figure, ter- 

 minated by the style and stigma, and connate with the calyx to higher 

 than the middle. The calyx has 7 — 10 nerves, and is toothless. The cap- 

 sule has 7 — 10 cells, is valveless, and opens irregularly near the rather 

 prominent nerves of the calyx. Seeds numerous, oblong, each enclosed in 

 a membranous aril, and obliquely affixed to the centre. A sarmentose 

 shrub. Leaves opposite, glabrous, entire, or dentate at the tip. Leaf 

 buds hairy with short reddish hairs. Flowers white, sweet-scented, ter- 

 minal, disposed subcorymbosely. The sexes are sometimes dioecious in 

 gardens, (l)ec. Prod. iii. p. 206.) 

 I)i > -v-aia Tlmnb. is a genus closely allied to / J hilad£lphus ; and it is highly 

 probable that some of the species will ultimately be found to be as hardy 

 M those of that genus; but, as this has not yet been proved to be the case, 

 we have treated it as only half-hardy. 



