OLEACE^E. 181 



* * * Flowers orange. 



8. A. tubero'sa, L. (BUTTERFLY-WEED. PLEURISY-ROOT.) 

 Stem very leafy, branching above, rough-hairy. Leaves 

 linear or oblong -lanceolate, chiefly scattered. Corolla 

 greenish-orange, with the hoods bright orange-red. Pods 

 hoary. Dry hill-sides and fields ; almost destitute of milky 



juice. 



2. ACERA'TES, Ell. GREEN MILKWEED. 



1. A. Viridiflo'ra, Ell. Stems ascending, 1-2 feet high, 

 minutely soft-downy, becoming smoothish. Leaves oval to 

 linear. The compact umbels of greenish flowers nearly 

 sessile, lateral, many-flowered. Dry soil, from Niagara 

 Falls westward. 



Var. laneeola'ta, Gray, has lanceolate leaves. S.W. 

 Ontario and N.W. 



Var. linea'ris, Gray, has elongated-linear leaves, and 

 low stems. Umbels often solitary. N.W. 



ORDER LXXII. OLEA'CE^S. (OLIVE FAMILY.) 



The only common representative Genus of this Order in 

 Canada is Fraxinus (Ash). The species of this Genus are 

 trees with pinnate leaves, and polygamous or dioecious 

 flowers without petals, and mostly also without a calyx; 

 stamens only 2, with large oblong anthers. Fruit a 1-2- 

 seeded samara. Flowers insignificant, from the axils of the 

 previous year's leaves. 



FRAX'INUS, Tourn. ASH. 

 * Leaflets with petioles. 



1. F. Ameriea'na, L. (WHITE ASH.) Fruit wingedfrom 

 the apex only, the base cylindrical. Branchlets and petioles 

 smooth and glabrous. Calyx very minute, persistent. Leaf- 

 lets 7-9, stalked. Rich woods, 



2. F. pubes'eens, Lam., (BED ASH) has the branchlets 

 and petioles softly pubescent, and the fruit acute at the base, 

 2-edged, and gradually expanding into the long wing above. 

 Same localities as No. 1. 



