90 Spring Flora of Ohio. 



Cor -nus al-ter-ni-fo'-li-a L. f. Alternate- leaved Cornel. — Shrub or tree, 

 8-25 ft. high ; branches greenish, streaked with white ; leaves alternate, 

 clustered at the ends, ovate or oval, long pointed, acute at base, 

 whitish and minutely pubescent beneath; fruit deep blue, on reddish 

 stalks. 



2. Genus NYS'-SA. — Flowers greenish, appearing with the leaves, 

 clustered or rarely solitary at the summit of axillary peduncles; 

 staminate flowers numerous in a simple or compound dense cluster 

 of fascicles; pistillate flowers solitary or 2-8, sessile in a bracted 

 cluster; fruit an ovoid or oblong drupe. 



Nys'-sa a-quat'-i-ca L- {N. sylvatica Marsh.) Sour or Black Gum ; 

 Tupelo; Pepperidge. — Middle-sized tree with horizontal branches; 

 leaves oval or obovate, alternate but mostly crowded at the ends of the 

 branchlets. 



LXVI. Order ER-I-CA'-CE-/E. HEATH FAMILY.— Shrubs, sometimes 



herbs; flowers regular or nearly so; petals 4-5; anthers i;sually ap- 

 pendaged or opening at the apex. 



Calyx free from the ovary a . 

 Calyx-tube adherent to the ovary h . 

 a. Corolla funuel-form or campanulate with spreading lobes ib . 

 a. Corolla between rotate and companulate, the anthers in depressions or pits fc). 

 a. Corolla urceolate, ovoid, ovate, cylindric or globular, lobes small d'. 

 a. Corolla salver-form, the tube hairy inside ; very fragrant (f). 

 a. Corolla of 5, obovate, spreading, distinct petals : leaves rusty-woolly 



beneath Ledum. 1 



b. Stamens 5 rarely more , long exserted, corolla funnel-form. ..Azalea. 2 



b. Stamens 10 rarely fewer , exserted, corolla bell-shaped. /?Aorft(rff);rf;oH. 3 

 c. Evergreen mostly smgoth shrubs, leaves entire or coriaceous Kalmia. 4 



d. Fruit fleshy g . 



d. Fruit dry, capsular e\ 



e. Shrubs, low ; corolla urceolate ; capsule globular Andromeda. 5 



e. Shrubs, low ; much branched ; corolla cylindric-oblong ; capsule de- 

 pressed Chamcrdaphne. (5 



e. Tree ; corolla ovate, 5-toothed ; capsule oblong-pyramidal Oxydendron. 7 



f Prostrate or trailing, scarcely shrubby ; leaves evergreen . . . Epigaa. 8 ' 

 g. Corolla ovate or urn-shaped ; flowers in terminal racemes or clusters (i). 

 g. Corolla cj'lindric-ovoid or slightly urn-shaped ; flowers few or single 



in the axils Gaulthevia. 9 



h. Petals 4, short, spreading : berries white Chiogenes. 10 



h. Petals 4, narrow, reflexed ; berries red 1 . 



h. Petals 5 ik). 

 i. Trailing, leaves thick and evergreen, entire Arctosfapliylos. 11 



k. Ovary 10-celled, 10-seeded Gaylussacia. 12 



k. Ovary 4-5-celled, many-seeded Vaecinhim. 13 



1. Stems very slender ; leaves small, evergreen Sehollera. 14 



