OLEACEAE. 723 



monly only i-seeded. 3-valved at the summit. [Greek name of Storax.] About 

 70 species, natives of America. Asia and southern Europe. Besides the following, 

 2 others occur in the southern and western U. S. 



Foliage and inflorescence glabrous; calyx glandular-scurfy. 1. S. Americana. 



Lower surfaces of the le. ves and inflorescence canescent or tomentose. 



Leaves oblong to oval, 2.5-6 cm. long. 2. 6". pulverulenta. 



Leaves obovate to oval, 5-15 cm. long. 3. 3". grandi/olia. 



1. Styrax Americana Lam. Smooth Storax. (I. F. f. 2834.) A shrub, the 

 foliage glabrous or nearly so. Leaves green on both sides, oblong, oval or obovate, 

 2-8 cm. long; flowers few or sometimes solitary, 8-14 mm. long, about the length 

 of their pedicels; petals oblong-lanceolate, acute, valvate or but slightly overlapping 

 in the bud; fruit subglobose, about 6 mm. in diameter. In moist thickets and along 

 streams, Va. to Fla., Ark. and La. March-April. 



2. Styrax pulverulenta Michx. Downy Storax. (I. F. f. 2835.) Similar 

 to the preceding, but the lower surfaces of the leaves, the calyx and pedicels are 

 stellate-pubescent or scurfy. Leaves oval or oblong, usually denticulate, pale 

 beneath; flowers in short terminal racemes and often in pairs in the axils, usually 

 longer than their pedicels ; petals puberulent on both sides or only on the exterior, 

 convolute or imbricated in the bud. In moist pine-barrens, Va. to Fla. and Tex. 

 March-April. 



3. Styrax grandifolia Ait. Large-leaved Storax. (I. F. f. 2836.) A 

 shrub. Leaves obovate or oval, tomentose or canescent and pale beneath, 5— 15 cm. 

 long, or on young shoots larger; flowers 10-16 mm. long, longer than their pedicels, 

 mostly several in loo?e sometimes elongated racemes; petals oblong, acutish, imbri- 

 cated or convolute in the bud, puberulent without and often also within; fruit 

 obovoid, about 8 mm. long. In woods, Va. to Fla. and Ga. March-May. 



Order 4. GENTIANALES. 



Herbs, shrubs, vines or trees. Leaves opposite, or rarely alternate. 

 Flowers regular. Corolla gamopetalous, rarely polypetalous, nerved, 

 wanting in Adelia and in our species of Fraxinus of the Oleaceae. 

 Stamens mostly borne on the lower part of the corolla when this is pres- 

 ent, as many as its lobes or fewer and alternate with them. Ovaries 2, 

 distinct, or 1 with 2 cavities (rarely more), or 2 placentae. 



a. Stamens (usually 2), fewer than the corolla-lobes, or corolla none; our species 

 trees or shrubs. Fam. 1. Oleaceae. 



b. Stamens as many as the corolla-lobes ; mostly herbs. 

 Stigmas distinct ; juice not milky; ovary 1, compound. 



Ovary 2-celled; leaves stipulate, or their bases connected by a stipular line. 



Fam. 2. Logantaceae. 

 Ovary i-celled, leaves not stipulate. 



Leaves opposite or rarely verticillate; corolla-lobes convolute or imbricated in 



the bud. Fam. 3. Gentianaceae. 



Leaves basal or alternate; corolla-lobes induplicate-valvate in the bud ; marsh or 

 aquatic herbs. Fam. 4. Menyanthaceae. 



Stigmas united; juice milky; ovaries 2 n our species. 



Styles united ; stamens distinct: pollen of simple grains. Fam. 5. Apocynaceae. 

 Styles distinct; stamens mostly monadelphous; pollen-grains united into waxy 

 masses. Fam, 6. Asclepiadaceae. 



Family 1. OLEACEAE Lindl. 



Olive Family. 



Trees or shrubs (a few genera almost herbaceous) with opposite or 

 rarely alternate simple or pinnate estipulate leaves and regular 2-4-parted 

 flowers in panicles, cymes or fascicles. Calyx inferior, usually small, 

 sometimes none. Stamens 2-4 ; filaments separate ; anthers ovate, 

 oblong or linear, 2-celled, the sacs longitudinally dehiscent. Ovary 



