umbellifertE. 129 



the permanent diverging styles. Seeds minute, usually in- 

 definite ; albumen fleshy. — Shrubs, with opposite simple leaves. 

 Flowers usually in cymes. 



HYDRANGEA. im?i.— Hydrangea. 



(From the Greek vSoip water, and ayyeiov, a vase ; in allusion to the form of the 

 capsule.) 



Marginal flowers usually sterile. Sterile Fl. Calyx mem- 

 branaceous, colored, veiny, 4 — 5-parted. Petals, stamens, and 

 pistils rudimentary or none. Fertile Fl. Calyx hemispheric, 

 adnate to the ovary, 5-toothed. Petals 5, ovate. Stamens 10. 

 Styles 2. Capsule 2 -celled, opening by a foramen between the 

 styles. Seeds numerous. 



1. H. arborescens Linn. : leaves ovate or oblong-ovate, acuminate, obtuse 

 or subcordate at base, toothed, smoothish; flowers in fastigiate cymes. 

 H. vulgaris Mich. 



Sandy banks. Penn. to Geor. W. to Miss. July. T^ .—Stem 4—8 feet high. 

 Leaves large, the veins pubescent. Flowers white or yellowish-v^^hite, varying 

 from all fertile to all sterile and radiate. Tree Hydrangea. 



2. H. radiata Walt. : leaves ovate, mostly cordate, acuminate, serrate, 

 white tomentose beneath ; flowers in fastigiate cymes, some of the marginal 

 ones-radiate and sterile. H. nivea Mich. 



Penn. to Geor. M«AZ. Tenn. May, June. T2 .— S'tem 6— 8 feet high. Flowers 

 large, white, very ornamental. Changes by cultivation. Rayed Hydrangea. 



Order LX. UMBELLIFER^.— Umbellifers. 



Calyx entire or 5-toothed. Petals 5, usually inflexed at the 

 point. Stamens 5, alternate with the petals. Ovary inferior, 

 2-celled ; styles 2, distinct ; stigmas simple. Fruit consisting 

 of two carpels, which are attached to a common axis by their 

 face (the commissure) irom which they separate when ripe; 

 each carpel traversed by several ribs or wings ; in the inter- 

 vening spaces {intervals) are often lodged longitudinal channels 

 or receptacles [vittce), containing colored oily matter. Seeds 

 usually adhering to the carpel; albumen copious, horny.— 

 Herbaceous plants with hollow stems. Leaves mostly com 

 poimd and sheathing at base. Flowers in umbels. 



Suborder I. ORTHOSPERMiE. 



Albumen flat or flattish on the face. 



