EXOGENS. 103 



Tribe 2. Trees or shrubs. Lvs. opp., simple, or comp., stip. 1. 



Cunonia capensis, KooD ELzi;. Fls. 5-merous, small, white, in dense 



racemes. Lvs. pinnate. Ova. free. Follicles 2. Small tree, with 



red twigs. Cape of Good Hope. Tribe 3. Trees or shrubs. Lvs. 



alt., simple, exstip. 1. Escallonia. Fls. 5-merous, handsome, white, 



pink, or red. Ova. adh. Boll opening at base. Numerous species, 



evergreen trees or shrubs. S. Am., chiefly in Chili. 2. Ilea vir- 



ginica, only spec. 6° high. Fls. 5-merous, white, racemed. Ova. 



adh. Boll 2-celled. 3. Brexia. Fls. 5-merous, leathery, greenish, 



umbelled. Ova. nearly free. Lvs. leathery. Drupe 5-ribbed, as 



large as an orange. Small trees. Madagascar. Tribe 4. Shrubs, 



trees. Lvs. opp., simple, exstip. 1. Philadelphus. Fls. 4^5~merous, 



white, clustered, resembling orange-blossonis. Ova. adh. Boll 3-5- 



celled, splitting into as many carpels. Shrubs. Many species. S. 



Atlantic States, Pacific States, Japan. P. corondrius, Mock Oka^tgis, 



8° high; fls. fragrant. Japan. P. grandiflorus, 6° high ; fls. large, 



scentless. Va., "S. P. Qordonidnus, similar, but talier; Oregon. 



Sev. other pretty spec, in XJ. S. 2. Decumaria barbara. Climbing 



shrub. Fls. 7-10-merous, white, fragrant, cymose; sta. oo. Ova. 



adh. Boll many-ribbed. Shores of streams, S. 3. Deiitzia. Shrubs. 



Fls. 5-merous, white, showy, panicled. Sev. species. Lvs. rough 



with stellate hairs. Japan," China. 4. Hydr&ngea. Shrubs. Fls. 



5-merous, cymose ; central fls. complete, outer fls. neutral, of large 



showy-colored sepals. Ova. adh. Boll 2-oelled, 2-beaked. H. 



hortensis, Garden H. Cymes globose, all the fls. neutral, colors 



various. Japan. H. giiercifblia, Oak-leaved H. Cymes panicled. 



5°-8° high. 6a., S. H. arborescens, cymes flat; lvs. ovate; 5°-7° 



high. Mid. and "W. States. H. radidta., 5°-8° high; Tenn., Car., 



Ga. Tribe 6. Scapigerous herbs. Fls. 4-merous. 1. Fr4ncoa. Lvs. 



rad., lyrate; scape racemed. Ova. free. Boll 4-valved, oo-seeded. 



Chili. Tribe 6. Herbs, usually scapigerous. Fls. usually 5-merous. 



Ova. 1-3-celled. 1. Parndssia. Lvs. rad., round, smooth. Petals 



with clusters of glandular staminodes. Fl. sol., large, white. Ova. 



free. Boll 1-celled. P. palustris, Grass- of Parnasstjs ; elegant, 



scape 1° high. Mts., Eur., Can. P. carolinidna, lvs. larger, scape 



l°-2° high. N. and S. 2. Heiichera. Kad. lvs. round, more or less 



lobed, large, geranium-like ; scape panicled. Ova. half-adh. Boll 1- 



celled, 2-beaked. Sev. spec, all handsome. N. Am., Siberia. H. 



ameriedna, Alum Root. Rt. astringent. Scape with loose panicle, 



2°-3° high. TJ. S. Sev. other Am. spec. 3. Boykinia aeonitifblin., 



cyme fastigiate, fls. secund, white. Ova. adh. Boll 2-celled, 2- 



beaked. Stem with palmilobed lvs. Mts., Va., N. C, Oregon. 4. 



Saxifraga, Saxiitragb. Rt. perenn., lvs. rad. Scape cymose or 



panicled; fls. white, pink, red, yellow. Ova. half-adh. Boll 2- 



celled, 2-beaked. 150 species, all handsome rock-plants. Both 



worlds. S. umbrosa, London Pride, Eur. S. mrginiensis, Early 



S. Lvs. pubescent; fls. white, purple-tinged. TJ. S. S. sarmentbsa, 



miscalled Beefsteak Gkkanitjm. Lvs. rounded, fleshy ; sending off 



axillary runners. Scape panicled ; fls. irreg., pink, spotted. China, 



Japan. 5. Astilbe. Lvs. 3-ternate; fls. panicled, white; sometimes 



fj* 9. Ova. half-adh. 6 spec., tall, branching herbs, resembling 



Spiraea. N. Am., Japan, Java, Himalayas. A. deccindrn, 3°-5° 



high. Mts., Va., S. A. japSnica, smaller, more delicate; fls. pure 



