PAPILIONACEAE. :-W 



sessile, linear or subulate: flowers pink or rose, in a dense terminal spike. 

 Sandy moist soil, July-August; infrequent; Fayette, Muscatine, Johnson, and 

 Story counties. 



P. cruciata L. Annual; stem 4-10 inches high, square or slightly wing- 

 angled, with spreading branches: leaves mostly in 4's, linear or oblanceolate: 

 spikes sessile or nearly so; flowers purple, greenish, or white; wings triangu- 

 lar-ovate, slightly cordate, awn-pointed. In mossy shaded places; July— Sep- 

 tember; Lake township, Muscatine county. 



P. Verticillata L. Annual, glabrous; stems 4-12 inches high, branches 

 mostly opposite, spreading; leaves in whorls of 4 or 5, a few scattered, acute, 

 punctate, linear; spikes long-peduncled; flowers purplish or greenish; wings 

 broadly oval, clawed, shorter than the pod. Prairies and open woods; June- 

 September; common. 



PAPILIONACEAE L. Pea Family. 



Trees, shrubs, vines or herbs, with alternate compound, stipulate 

 leaves, and papilionaceous perfect flowers in spikes, heads, panicles or 

 racemes. Calyx of 5 sepals, often unequal, more or less united. Coralla 

 of 5 petals; the upper one known as the standard is the largest and in 

 the bud encloses the others, usually reflexed; the lateral petals or wiugs 

 are oblique and exterior to the two lower petals; the lower more or less 

 conniviDg by their edges to form the keel which encloses the stamens and 

 pistil. Stamens monodelphous, diadelphous or distinct, 10, rarely 9 or 5. 

 Ovary simple, superior, usually 1-celled; style simple. Fruit a legume, 

 2-valved, 1-many seeded, dehiscent or indehiscent, or else a Ioment. This 

 and the following two families are usually included under Leguminosae. 



Tribe Podalyrieae. Leaves 3-foliate; stamens distinct. 

 Baptxsia. A single genus in our area. 



Tribe Qenisteae. Leaves digitate or simple; stamens monodelphous; 

 anthers of 2 kinds. 



Crotalaria. Leaves simple ; calyx nearly equally 5-lobed. 

 Lupincs. Leaves digitate; calyx deeply 2-lipped. 



Tribe Trifolieae. Leaves 3-foliate, leaflets denticulate; stamens diadel- 

 phous. 



TRiFOiiiDM. Flowers capitate: pods straight. 



Melilotcs. Flowers racemose : pods coriaceous. 



Medicagu. Flowers racemose or spicate: pods curved or coiled. 



Tribe Loteae. Leaves 3-foliate, leaflets entire; stamens diadelphous. 



Hosackia. With us the only genus. 

 Tribe Psoraleae. Leaves glandular-dotted; stamens mostly monodel- 

 phous; pod small, indehiscent. 



Psoralea. Leaves digitately 3-5-foliate. 



Amorpha. Coralla of one petal, the standard. 



D&dea. Wings and keel adnate to the middle of the cleft stamen tube. 



Petalostemon. Corolla nearly regular; stamens 5. 



Tribe Galegeae. Leaves usually not dotted, pinnately several-foliate; 

 flowers racemose; stamens mostly diadelphous. 



Tephrosia. Herb; leaves odd-pinnate; pod flat. 

 RobinIa. A small tree; leaves odd-pinnate. 

 Astragalus. Pod inflated, partly or entirely i-celled. 

 Oxytropis. Stemless silky-pubescent herbs ; keel pointed. 

 Glycvrrhiza. Leaves scaly or dotted; pod covered with hooked prickles. 



