Mimosa Family. 43 



gland near the base of the petiole; stipules deciduous; flowers in a raceme; sta- 

 mens 10, 3 upper small, imperfect; pod curved, 10-20-seeJed. Low grounds; 

 July-August; infrequent; Dubuque, Scott, Muscatine, Louisa, Linn, Appa- 

 noose, Ringgold, Page, and Fremont counties. 



C. tora L. Low Sennit. Annual; leaflets 2-1 pairs, obovat e, gland between 

 or above lowest pair; pod long and slender, strongly curved. Reported from 

 Story county; introduced. 



GYMNOCLADUS Lam. Flowers dioecious or polygamous, regular, in ter- 

 minal reeemes. Calyx tubular, 5-cleft, divisions linear. Petals equal, oblong, 

 inserted on the calyx tube. Stamens 10, distinct, alternately shorter, insert- 

 ed with the petals, included. Pod large, compressed, oblong, 4-8 inches 

 long, 2 inches wide, tough, pulpy within, several-seeded. 



G. canadensis Lam. Kentucky Coffee-tree. A large tree, with rough gray- 

 ish bark, and a large pith-like center; leaves unequally bipinnate, the lower 

 two pairs of pinnae of single leaflets, the upper of 7-13 ovate acuminate leaf- 

 lets; stipules none, seeds y, an inch in diameter, polished. Rich soil; May- 

 June; locally infrequent throughout the state; Allamakee, Clayton, Dubuque, 

 Fayette, Delaware, Scott, Muscatine, Louisa, Lee, Johnson, Henry, Story, 

 Dallas, Decatur, Fremont, Pottawattomie, Shelby, and Woodbury counties. 



GLEDITSCrfIA L. Trees, with pinnate or bipinnate leaves, and usually 

 well developed thorns above the axils. Flowers polygamous, small, greenish, 

 in spike-like racemes. Sepals 3-5, spreading, united at the base. Petals 3-5, 

 equal in length to the sepals, the two lower sometimes united. Stamens 3-5, 

 opposite the sepals. Pod compressed, continuous, usually pulpy between the 

 seeds. Seeds flat. 



G. triacanthos L. Honey Locust. A large tree; spines branched; leaflets 

 laneeolate-oblong, alternate, obscurely serrate, pod a foot or more in length 

 and fully an inch in width, flat, linear-oblong, often twisted, hanging, inter- 

 spaces filled with a sweetish pulp; seeds flattened, globose, dark. Rich woods; 

 June; frequent throughout the state. 



MIMOSACEA.E Richenb. Mimosa Family. 



Ours a perennial herb, with alternate bipinnate leaves, small stipules. 

 and small regular perfect greenish flowers in pedunculate axillary heads. 

 Represented by the genus Desmanthus Willd. 



D. brachylobus Benth. Stem angled, glabrous or nearly so, 1-4 feet high; 

 pinnae and leaflets numerous; calyx campanulate, 5-toothed; petals 5, distinct; 

 stamens 5, distinct; pods many, in a dense globose head, flat, linear, curved, 

 2-valved, several-seeded. Alluvial soil; June-August; frequent; Dickinson, 

 Calhoun, and Fremont counties. 



DRTJPA.CEAE DC. Plum Family. 



Trees or shrubs, with alternate petioled serrate leaves, and regular 

 mostl}' perfect flowers which are solitary or variously clustered. The 

 bark exudes a gum and the leaves, seed, and bark contain a bitter princi- 

 ple called prussic acid. Calyx inferior, deciduous, 5 lubed, the lobes im- 

 bricated in the bud. Petals 5, inserted along with the many stamens on 

 the calyx. Style simple, stigma small, capitate. Ovarj 1-celled, 2-ovul- 

 ed. Fruit a drupe. Often included wi„h the following family. 



Prunus. Drupe glabrous; native species. 

 Amygdalus. Drupe velvety ; introduced species. 



