EXOGENS. 71 



Tribe 1. Style gynobasic. Akaines 4, rarely 2. Hispid herbs, 

 rarely shrubs ; harmless, often cordial, emollient. 58 gen., 688 spec. ; 

 chiefly in S. Eur., Middle Asia; rare in Am. 1. Rochelia (only type 

 here given with 2 akaines), small herbs. 2. Cynoglossum, Hounds- 

 TONQUB, Beggar's Lice, akaines prickly. Coarse weeds. 3. Myo- 

 sotis, FoRGET-MB-NOT. Small herbs; fls. small, sky-blue or white 

 with yellow eye. M.^aMsiWs, prettiest spec. 4. Alkanna, Alkanbt. 

 Emollient herbs ; fls. small, blue, purple, yellow, or white. One of 

 the Fou7- Cordial Flowers. A. tinctoria, rts. large, furnishing a red 

 dye. S. Anchusa, BtroLOSs. Close to last. A. crispa, hairs. Fig. 

 106, 2. 6. Symphytum, Comfrky, Q). bold herbs from rhiz. or tuber ; 

 fls. large, yellow, purple, blue. S. officinale, fl., vert, sec. Fig. 5, 2. 

 7. Borago offichialis, Borage. Q, spreading, bristly; fls. without 

 corolla-tube, blue or purple, handsome. One of the Four Cordial 

 Flowers. Tribe 3. Style terminal. Akaines 4. 1. Heliotropium, 

 Heliotrope. Qj. herbs or undershrubs ; fls. small, white or lilac. 

 Many spec., chiefly trop. H. peruviana, finest; fls. vanilla-scented. 

 Peru. Tribe 3. Style terminal, 2-lobed. Drupe 4-seeded. Shrubs 

 or small trees; trop., both worlds. 1. Tournefortia, fls. like Helio- 

 trope; shrubs, erect or twining; both worlds. T. heliotropioides, 

 Buenos Ayres. 2. Ehretia, fls. large, white. E. buxifolia, box-leaved 

 shrubs. E. serrdta, tree with fragrant fls., valuable wood. E. Ind. 

 Tribe 4. Style terminal (rarely 0), twice-forked. Drupe 4-seeded. 

 Shrubs or trees ; both worlds. 1. Cordia. Fls. show}'. 200 spec. 

 C. Mi^xa, tree, Asia. Cultivated in Egypt from immemorial time ; 

 wood made into mummy-cases. C Rumphii, tree, Asia ; wood valua- 

 ble, dark, mottled, musk-scented. C. Gerascdnthus, tree, wood valu- 

 able, W. Ind. 



Ord. 48. Convolvulacese. Morning-Glories. Bindweeds. — 

 Characters of Alliance. Twiners, herbaceous or shrubby, rarely erect, 

 often milky. 5 Tribes. Tribe 1. (Only tribe with sessile stigma.) 

 Boll 1-celled. Erycibe Climbing shrubs, fls. showy, paniculate. 

 7 spec, trop. Asia. Tribe 2. Styles 2, boll 4-celled. Only gen., 

 Ciiscuta (Cusciita, Continental accent), Dodder. Leafless, thread- 

 like, amber-colored, twining parasites ; fls. small, white. Common in 

 hot and temp regions. Many spec. C. jBpiHnMm, on Flax, Clover. Fig. 

 93 ; emb., Fig. 190, C. Eur. Tribe 3. Carpels 2-4; styles distinct, 

 basilar. Dichondra, small prostrate herbs ; fls. small ; hot regions, 

 both worlds. Tribe 4. Style simple. Boll 1-2-3-4-celled, 4-8- 

 seeded. Usually twiners. 1. Calystegia, Bracted Bindweed. Boll 

 1-eelled, 4-seeded. Fls. large, showy, sol., involucrate. 14 spec, 

 usually climbing. C. sepium, common. 2. Convolvulus. Boll 2- 

 celled. Oi 2|.. Twining or trailing. C. Craeoriem, evergreen, shrubby ; 

 C. h'lcolor [minor), Av/arf; C. althceoides, C iidlicus, 01, twining. S. 

 Eur. 3. Exogonium Purrja, similar, twiner ; rt. is the Jalap of phar- 

 macy. Fig. 87. Mex. 4. Ipomoea, boll 2-celled. Morning Glo- 

 ries. Many fine species. I. pandurdta., Wild Potato, fls. large, 

 white, eye purple; rt. large. N. Y. to 111., and Ga. 5. Pharbitis, 

 similar, boll 3-celled. P. hispida (Convolvulus major), fls. of various 

 colors.; boll. Fig. 204. Eur. P. Nil, purpiirea, showy. Am. species. . 

 6. Batatas, boll 4-celled. 20 spec, twining; fls. large. B. edulis, 

 Sweet Potato. S. Am. 7. Quamoclit. Mex. name. Boll 4-celled. 

 Fls. small, red or white, showy. tvviners. Trop. Am., Asia. Q. 



