32 ANACARDIACEAE. 



ANACARDIACEAE Lindl. Sumac Family. 



Small trees or shrubs, with milky acrid juice, alternate odd-pinnate 

 exstipulate leaves, and perfect or polygamous greenish or yellowish flow- 

 ers. Sepals, petals, and stamens 5. Styles or stigmas 3. Fruit a small 

 dry drupe. Represented by the genus Rhus L. 



* Flowers polygamous, in terminal thyrsold panicles. 



F^. typhina L. Staghom Sumac. Tree 10-20 feet high; wood yellow, young- 

 branches densely villous; leaflets 11-31, sessile, lanceolate, acuminate, serrate^ 

 pale pubescent beneath; fruit red, with long crimson hairs. Wooded hill- 

 sides; May-June; frequent; Winneshiek, Allamakee, Clayton, Dubuque, 

 Fayette, Jackson, Delaware, Scott, Jones, and Emmet counties. (R. hlria (L.) 

 Sudw.) 



R. glabra L. Common S. Shrub 3-15 feet high; branches smooth, some : 

 what glaucous; leaflets 11-31, sessile, lanceolate-oblong, acuminate, serrate, 

 pale beneath; fruit red, with short crimson hairs. Open uplands, thickets; 

 June; common. 



* * Fton'crs polygamous, in loose axillary panicles. 



R. radicans L. Poison Oak. Poison- Ivy. Bushy, 1-2 feet high or else a 

 woody vine, climbing high; leaflets 3, ovate, acuminate, entire, sinuate or 

 somewhat lobed, more or less pubescent beneath; fruit globular, smooth, 

 white or yellowish. Rich soil, waysides and thickets; June; common. 

 Usually given as R. toxicodendron L. 

 -* * * piowers polygamo-dioecious, appearing before the leaves, in terminal spicatc 

 clusisrs. '" ■• 



R.. canadensis Marsh. Shrub 2-6 feet high; leaflets 3, crenately tobt'hed,' 

 pubescent when young,- later glabrate, lateral ones ovate,' sessile, terminal 

 one ovate with a cuneate base, short stalked; fruit globose, red, pubescent. 

 Rocky woods; April; frequent; Delaware, Muscatine, Lee, Henry, Wapello, 

 Van Buren, Jefferson, and Linn counties, (JR. aromaiica Ait.) 



POLYGALACEAE Richenb. Milkwort Family. 



Ours herbs,, with, simple entire alternate, opposite or verticillate ex- 

 stipulate leaves, and mostly racemose, spicate, or axillary flowers. Pedi- 

 cels frequently 2 : bracted at the base. Flowers perfect, irregular. 

 Sepals 5, the upper and 2 lower small and often greenish, the 2 lateral 

 large, colored. Petals. 3, united into a split tube, more or less adnate to 

 the stamens. Stamens 6 or 8, monodelphous or diadelphous; anthers 1- 

 celled, opening at the apex by a hole or chink. Ovary 2-celled, 2-ovuled; 

 style simple. Fruit a 2-celled 2-see'ded capsule. Seeds usually caruilcled 

 and hairy. Represented in our flora by the genus Polygala L. 



P. senega L. Seneca Snalteroot. Perennial; glabrous or nearly so; root- 

 stocks hard, knotty; stems several; (i-12 inches high; leaves lanceolate or ob- 

 long-lanceolate, alternate, sessile, lower small, scale-like; flowers white, in a 

 solitary close spike; wings round-obovate. Rocky woods; May-June: fre- 

 quent; Winneshiek, Fayette, Scott, Muscatine, Johnson, Story, and Cerro 

 Gordo counties. 



P. sanguinea L. Annual; stem mostly simple, 0—1.5 inches high, glabrous; 

 leaves oblong-linear, alternate, sessile; flowers in a globular or oblono- bead, 

 rose-purple, greenish, rarely white; wings broadly ovale, sessile, exceeding 

 the pod. Moist prairies; June-September; common. (P. vtridesrens L.) 



P. incarnata L. Annual, glaucous; stem simple, slender; leaves distant 



