FARWELL ON THE FLORA OF DETROIT. 59 



Okder 28. Gentiaxales. 

 FAMILY 77. OLEACE.F. Olive Family.. 



256. FRAXINUS, Lin. 



625. Americana, Lin. White Ash. In woods on Belle Isle. Rare. 



626. Pennsylvanica, Marsh. Red Ash. 



627. nigra, Marsh. Black Ash. 



More or less common on Belle Isle. 



FAMILY 78. GENTIANACE.E. Gentian Family. 



257. GENTIANA, Lin. 



628. crinita, Froel. Gentian. Near Linden Park. Rare. 



629. alba, Muhl. G. Andreifsii f. alhiflora Britt. In moist places and 



borders of woods on Belle Isle. Frequent. 



630. Andrewsii, Griseb. With the preceding, but more common. 



FAMILY 79. APOCYNACE.E. Dogbane Family. 



258. APOCYNUM, Lin. Dogbane. 



631. androstemifolium, Lin. Bitter-root. 



632. var. incanura, A. DC. 



633. cannabinum, Lin. Canadian Hemp. 



634. var. glaberrimum, A. DC. 



635. var. hypericifolium (Ait.) A. Gr. 



636. var. pubescens (R. Br.) A. DC. All the various forms of Apocy- 

 mum occur in moist or dry places, in thickets, on banks of streams, 

 in sand or in hard dry clay. The bitter-root and its variety occur 

 near Palmer Park ; the type has the leaves smooth or nearly so under- 

 neath, but in the variety they are canescent. The Canadian Hemp 

 and its first named variety are frequent on Belle Isle, and the other 

 varieties near Linden Park. 



FAMILY 80. ASCLEPIADACE.F. Milkweed Family. 



259. ASCLEPIAS, Lin. Milkweeds. 



637. tuberosa, Lin. Pleurisy-root. Copses at Linden Park. Rare. 



638. purpurascens, Lin. Near Linden Park. Frequent. 



639. incarnata, Lin. Lo^v grounds on Belle Isle and elsewhere. Common. 



640. exaltata, Lin. A. phytolaccoides Ph. Roadsides on Belle Isle. Rare. 



641. Syriaca, Lin. Fields on Belle Isle. Common. 



OeDER 29. POLEMONIALES. 



FAMILY 81. CONVOLVULACE-F. Morning Glory. 



260. IPOMCEA, Lin. 



642. purpurea (Lin.) Roth. Morning Glory. Waste places. Frequent. 



261. CONVOLVULUS, Lin. 



643. arvensis, Lin. Small Bindweed. Waste places. Frequent. 



262. VOLVULUS, Medic. 



644. sepium (L.) Medic. Near Palmer Park. Rare. 



645. var. Americanus (Sims.) Convolvulus sepium Lin. var. Ameri- 

 c«H«s Sims, Bot. Mag. T. 732: 1804. On Belle Isle. Common. 



646. hederaceus (Wall.) O. K., var. pubescens (Lindl.) Calt/stegia pubes- 



cens Lindl. Journ. Hort. Soc. 1, 70: 1846. A double-flowered variety 

 of the East Indian V. hederaceus that has escaped from cultivation 

 to waste places. The flower is composed of innumerable separate 

 petals instead of a series of gamopetalous corollas. At a distance 

 looks very much like a carnation. 



