Spring Flora op Oklahoma 
59 
On rocks or rocky soil. May-July. Wichita and Arbuckle 
Mountains. 
FAMILY 30. HYDRANGEACEiE. Hydrangea Family. 
Shrubs, trees or vines, with simple, opposite leaves 
and no stipules. Flowers perfect or the exterior ones of 
the cluster sterile. Petals and sepals 5. Stamens twice 
as many as the sepals, or numerous, epigynous. Carpels 
2-10, united or the apex free, the lower half adnate to 
the calyx. Seeds numerous. 
I. PHILADELPHUS L. 
Shrubs. Leaves simple, opposite, 3-5-ribbed, petioled, 
without stipules. Flowers solitary or in cymes, large, 
white. Calyx tube top-shaped, the epigynous limb 4-5- 
parted persistent. Petals 4-5, rounded or obovate. Sta¬ 
mens 20-40, shorter than the petals. Ovary 3-5 celled, 
many-seeded. Styles 3-5, more or less united. 
1. Philadelphus coronarius L. Mock Orange. A shrub. Leaves 
short-petioled, oval, elliptic or ovate-elliptic, glabrous above, pubes¬ 
cent beneath, acute or acuminate at the apex, rounded or narrowed 
at the base, denticulate with distant teeth 3-nerved. 
A cultivated shrub. May-June. 
FAMILY 31. ALTINGIACEiE. Altingia Family., 
Forest trees producing a balsamic resin, with furrowed 
bark, and terete or sometimes corky-winged branchlets. 
Leaves alternate, glandular-serrate, palmately lobed; 
stipules mostly deciduous. Flowers usually monoecious, 
sometimes perfect, in heads. Perianth wanting. Heads 
of staminate flowers in terminal racemes or panicles. 
Pistillate flowers in solitary, long-peduncled, axillary 
heads. Fruit a hard, dry, multi-capsular head, some¬ 
times armed with stout, persistent stigmas. 
