EXOGENS. 73 



Ord. 49. Loganiacese. — Characters of Gentianacese ; but Ivs. stip., 

 usually lanceolate ; fr. sometime a drupe or berry. Herbs, Shrubs, Trees. 

 30 gen., 200 spec, trop., botb -worlds. 4 Tribes, several gen. in each. 

 Tribe 1. Berry. 1. Gaertnera, bushes or small trees. (Near Rubia- 

 ceae also; but there the ova is adh.) 30 spec, W. Af. and islands, 

 Malaysia. Tribe 2. Berry. I. Strychnos. Trees or climbing 

 shrubs; fls. fragrant, sds. poisonous. Sev. spec, trop. Asia and Am. 

 S. Nxlx-vomiea, tree ; berry large, orange-like. S. B. Asia. Fig. 

 240. 2. Desfontainea. Evergreen shrubs ; fls. scarlet, showy. Peru. 

 Tribe 3. Boll. 1. Logania. Herbs or shrubs ; inconspicuous. 16 

 spec, Australia, New Z. 2. Spigelia, Pink-root. Herbs. 0, Q|.. 

 30 spec, trop., sub-trop.. Am. ; rts. medicinal. S. marilandiea, 1°- 

 2° high; fls. showy, red without, yellow within. Penn., W. and S. 

 Tribe 4. Sds. winged. Norrisia. Malayan shrubs. 



Ord. 50. Asclepiadacese. Milkweeds. — Corol. reg., 5-merous, 

 isostemonous ; sta. with the fllaments usually coherent into a tube 

 around the ova., and furnished behind the anther with appendages 

 forming a corona. PoUeu-masses (pollinia) adherent to stigma. Ova. 

 2, distinct, styles appressed, united by a common 5-angled stigma. 

 Fr. 2 follicles, or 1 by arrest. Sds. oo, often comose. Perisperm 

 rarely 0. Woody (rarely herbaceous) plants with milky, often poi- 

 sonous, juice; often climbing ; sometimes fleshy, leafless. Lvs. opp., 

 rarely whorled or alt. ; petioled, simple, entire. Fls. in umbels or 

 panicles, rarely sol. 141 gen., 1000 species, chiefly trop., both worlds. 

 5 Sub-Orders ; distinctions in pollinia and coronse. 



Sub-Ord. 1. Twining plants and fleshy, leafless herbs. Old World. 

 1. Stapelia, fleshy, leafless ; fls. large, star-shaped ; handsome, but fetid. 

 100 spec. Cape of G-ood Hope. 2. Hoya, twining, or creeping by 

 adventitious rts. ; lvs. fleshy, fls. umbelled. Many fine spec, trop. 

 Asia. 3. Stephanotis. Climbing shrubs; fls. large, fragrant, white, 

 umbelled. Few spec, Madagascar. Sub-Ord. 2. Perenn. twiners, 

 Am. 1. Gonolobus. Lvs. cordate, fls. rotate, dull-colored. 60 

 spec, N. Am. Sub-Ord. 3. Many gen. 1. Asclepias. Erect 

 herbs with rather small but showy umbelled fls. Many spec. Am., 

 few in Asia. A. dcida, Soma. Plant, sacred in India. A. tube- 

 rbsa, BtTTTEEFLY Weed, IT. S. ; fls. orange. Fig. 172. A. euras- 

 sdvica, S. Am., fls. scarlet A. incarndta, fls. pink; sd.. Pig. 195, A. 

 Swamps, IT. S. Sub-Ord. 4. Few gen. 1. Secamone, 30 spec, ev. 

 climbing or decumbent shrubs. S. Af., Ind., Australia. Sub-Ord. 

 5. Pew gen. 1. Periploca, 6 species, twiners, ornamental ; trop. Asia, 

 Af. ; one, P. graeca, reaching to S. Eur. 



Ord. 51. Apocynaceae. Dogbanes. — LikeAsclepiadacese; but pollen 

 granular ; anth. sometimes coherent ; fls. large, showy, usually fragrant ; 

 carpels 2, sometimes 3-4 ; fr. follicle, boll, or berry. Trees or Shrubs, 

 often climbing or perennial Herbs; milk usually poisonous; sometimes 

 wholesome. 100 gen., 600 spec, intertrop., both worlds. 4 Tribes : 



Tribe 1. Follicle. 1. Plumieria. Trees or shrubs ; lvs. fleshy, 

 tufted. Sev. spec. P. rubra, Ked Jessamine, Fra-Ngipanni ; fls. 

 red, very fragrant. S. Am. 2. Mandevillea (Echites) suaveolens, 

 Chili Jessamine, Pokts' J. Only spec; tall twining shrub; fls. 

 white, fragrant. Chili. 3. Parechites, similar, sev. spec. ; fls. white, 

 yellow, rose; Ind., China, Japan, Borneo. 4. Gelsfemium (better 

 Gelseminum ; best Gelsominum : see Etymons, I.). Only spec. G. 



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