Wood-sorrel Family. 27 



tered at the ends of the branches; sepals ovate, awn-pointed; petals scarcely 

 longer thaa the sepals, light rose-tinted or whitish; stamens sometimes only 

 r>. Waste places; May-August; infrequent; Fayette, Muscatine, Lee, and 

 Johnson counties. 



OXALIDACEAE Limll. Wood-sorrel Family. 



Aunual or perennial herbs, with acidic juice, palmately trifoliate 

 leaves, and perfect regular flowers in umbel-like or forking cymes. Rep- 

 resented in Iowa by the genus. 



OXALIS L. Wood-sorrbl. Leaflets obcordate,. Sepals 5, persistent, im- 

 bricated. Petals 5, withering after flowering, sometimes united at the base, 

 longer than the sepals. Stamens 10, monodelphous at the base, alternately 

 shorter. Styles 5, distinct; stigmas terminal. Capsule oblong, somewhat 

 5-lobed, 5-celled, cells 1-several seeded. 



O. stricta L. Yellow W. Annual or perennial, rootstock slender; stem 

 leafy, glabrous to villous: leaves long-petioled, sensitive; stipules none; flow- 

 ers yellow, peduncles long, axillary. Fields and woods; May-September; 

 common. 



O. Violacea L. Viclet W. Stemless perennials, from a, brownish scaly 

 bulb; leaflets broadly obccrdate; scapes 2-7 inches high, longer than the 

 petioles, umbellately flowered; flowers nodding, violet. Fields and woods; 

 May-June; common. 



Floerk.ea proserpinacoides Willd. of the order Limnaxtiiaceae Limit.. 

 has been reported from Lee county by Arthur. Annual, with 3-5 oblong or 

 linear-oblong sometimes 2-3-cleft leaflets; and solitary axillary peduucled 

 white flowers. Sepals and petals 3. Stamens 6. Ovaries and stigmas 3. 

 Fruit 1-3 roughish fleshy achenes. River banks; April-June. 



BALSAMINACEAE Lfadf. Jewel-weed Family. 



SucculeDt herbs, with smooth weak hollow stems, simple petioled 

 alternate exstipulate leaves, and showy irregular axillary nodding flow- 

 ers. Sepals 3, the lateral 2 small, green, nerved; the posterior one large, 

 petaloid, saccate, spurred. Petals 3, 2 of them 2-cleft. Stamens 5; 

 filaments appendaged by scales on their inner side which connive over 

 the stigma. 



IMPATIENS L. Touch-me-not. Leaves ovate, coarsely toothed. Ovary 5- 

 celled, oblong; stigmas sessile, 5-lobed. Pod 5-valved, 5-celled, sometimes 

 partitions not apparent, valves coiling elastically in dehiscence projecting 

 the seed. Seeds several in each cell. Ours annuals, 2-4 feet high. 



I. pallida Nutt. Pale T. Leaves ovate-oblong; pedicels 2-4 flowered; 

 flowers pale yellow, sparingly dotted; sepals dilated transversely, broader 

 than long, tipped with a short recurved spur. Moist alluvial soil; July- 

 September; common. (I. aurea Muhl.) 



I. fulva Nutt. Spotted T. Leaves rhombic-ovate; pedicels 2-4-flowered; 

 flowers orange-yellow, thickly spotted with reddish-brown; sepals dilated 

 lengthwise, longer than broad; spur elongated, closely reflexed. With the 

 preceding but less frequent. (I. hifiora Walt.j 



RUTACEAE Juss. Rue Family. 

 Shrubby plants, with alternate or opposite exstipulate compound 

 leaves dotted with transparent glands which contain a volatile aromatic 



