142 CORNACE^. 



H. Virginica Linn. : leaves ovate, acute, toothed, cordate, with the sinus 

 small, scabrous beneath ; flowers in axillary clusters. 



var. parvifoUa Nutt. : leaves smaller and more pubescent beneath. 



Woods. Can. to Flor. and Louis. Oct., Nov. T^- — "^^^^ ^ — 12 feet high- 

 Flowers in threes, polygamous, greenish- yellow, appearing in autumn and con- 

 tinuing during a great part of the winter ; the fruit is not perfected until about 

 September of the following year. Var. parviflora is found on the mountains of 

 Pennsylvania, Witchhazel. 



Order LXIJI. CORNACE^.— Dogwoods. 



Sepals 4, adherent. Petals 4, distinct. Stamens 4, alternate 

 with the petals. Ovary 2-celled ; style filiform ; stigma simple. 

 Fruit a 2-celled drupe crowned with the remains of the calyx. 

 Seed solitary ; albumen fleshy. — Trees or shrubs, with opposite 

 rarely alternate leaves. Flowers capitate, umbellate or corym- 

 bose. 



CORNUS. Linn.— Dogwood. 



(From the Latin cornu, a Jiorn ; in allusion to the toughness of the wood.) 



Calyx adherent to the ovary ; the limb minute, 4-toothed. 

 Petals 4, oblong, spreading. Stamens 4. Stigma obtuse. 

 Drupe with the cells not united. 



* Flowers capitate, surrounded by a petaloid involucre. 



1. C. Canadensis Linn. : herbaceous ; lower leaves opposite, small ; 

 upper on short petioles, verticillate, veined ; leaves of the involucre 4, broad- 

 ovate, acuminate ; flowers numerous, very small, in a terminal head ; drupe 



Damp woods. Acct. Amer. and Labrador to Car. W. to Oregon. May, June. 

 1].. — Stem 4 — 6 inches high, simple, with one or two pairs of opposite leaves and 

 a whorl of about 6 at the summit. Involucre greenish-wliite, petaloid, much 

 longer than the flowers. Drupe red. Dwarf Dogwood. 



2. C.forida Linn.: afborescent; leaves ovate, acuminate, whitish be- 

 neath; leaves of the involucre 4, large, obcordate, nerved, with a callous 

 notch at the apex ; flowers in small terminal heads ; drupe oval. 



Woods. Can. to Car. W. to Miss. May, June.— A tree 15—20 feet high, 

 with grayish bark. Flowers greenish-yellow. Invohiere about 3 inches in di- 

 ameter, white, sometimes tinged with red. Drupe scarlet. 3Iedicinal. Big, 

 Med. Bot. ii. 73. Flowering Dogwood. 



** Flowers naked ^ in cymes. 

 •f Leaves opposite. 



3. C. circinata L'Herit. .- branches warty ; leaves on short petioles, 

 broad-oval, acuminate, white-downy beneath : cymes crowded, depressed ; 

 drupe globose. C. tomentulosa Mich. 



Banks of streams. Can. to Virg. W. to 3Iiss. June, July. T^. — Stem 6 — S 

 feet high, with straight slender branches. Leaves broad, waved on the edges. 

 Flowers white. Drupe small, light-blue. Oval-leaved Dogwood. 



