50b. Stipules narrowly lanceolate or subulate, less than 1 cm. long --54.

51a. Stems glabrous or minutely p.u.b.escent; leaves ac.u.minate --52.

51b. Stems hispid or densely p.u.b.escent; leaves ovate or ovate-lanceolate, obtuse or barely acute --53.

52a. Leaves glabrous on both sides =Tick Trefoil, Desmodium bracteosum.=

52b. Leaves rough above, hairy beneath =Tick Trefoil, Desmodium bracteosum var. longifolium.=

53a. Leaflets broadly ovate =Tick Trefoil, Desmodium canescens.=

53b. Leaflets ovate-lanceolate =Tick Trefoil, Desmodium illinoense.=

54a. Flowers 10-12 mm. long (1-2 m. high) =Tick Trefoil, Desmodium canadense.=

54b. Flowers 5-8 mm. long (5-8 dm. tall) --55.

54c. Flowers 3-4 mm. long (4-8 dm. tall) --56.

55a. Leaflets broadly ovate =Tick Trefoil, Desmodium viridiflorum.=

55b. Leaflets oblong-ovate =Tick Trefoil, Desmodium dillenii.=

56a. Leaflets 3-5 cm. long, oblong-ovate, scabrous above =Tick Trefoil, Desmodium rigidum.=

56b. Leaflets 1-2.5 cm. long, broadly ovate or oval, not scabrous above --57.

57a. Stem and leaves glabrous or very nearly so =Tick Trefoil, Desmodium marilandic.u.m.=

57b. Stem and leaves conspicuously p.u.b.escent =Tick Trefoil, Desmodium obtusum.=

58a. Flower-cl.u.s.ters sessile, or on peduncles shorter than the subtending leaves --59.

58b. Flower-cl.u.s.ters, or many of them, on peduncles longer than the leaves --61.

59a. Leaves linear-oblong =Bush Clover, Lespedeza virginica.=

59b. Leaves ovate or oval --60.

60a. Leaves and stem velvety or downy =Bush Clover, Lespedeza stuvei.=

60b. Leaves and stem glabrous, or with close appressed p.u.b.escence =Bush Clover, Lespedeza frutescens.=

61a. Leaves ovate or broadly elliptical; corolla conspicuously exceeding the calyx --62.

61b. Leaves linear-oblong; calyx about as long as the corolla =Bush Clover, Lespedeza manniana.=

62a. Stem erect or ascending --63.

62b. Stem trailing; peduncles much exceeding the leaves =Bush Clover, Lespedeza proc.u.mbens.=

63a. Villous-p.u.b.escent; inflorescence dense; some peduncles shorter than the leaves =Bush Clover, Lespedeza nuttallii.=

63b. Slightly p.u.b.escent or glabrous; inflorescence loose, on peduncles much longer than the leaves =Bush Clover, Lespedeza violacea.=

LINACEAE, the Flax Family

Herbs with simple leaves, and regular flowers, having 5 sepals, 5 yellow or blue petals, 5 stamens, and 5 styles.

1a. Flowers blue (3-6 dm. high; summer) =Flax, Linum usitatissimum.=

1b. Flowers yellow (3-8 dm. high; summer) (Wild Flax) --2.

2a. Middle stem-leaves below the branches opposite =Wild Flax, Linum striatum.=

2b. Middle stem-leaves below the branches alternate --3.

3a. Leaves narrowly lanceolate to linear, 1-4 mm. wide --4.

3b. Leaves oblanceolate to oblong, 4-6 mm. wide =Wild Flax, Linum virginianum.=

4a. Leaves entire =Wild Flax, Linum medium.=

4b. Upper leaves glandular-ciliate =Wild Flax, Linum sulcatum.=

OXALIDACEAE, the Wood Sorrel Family

Herbs, with alternate or basal compound leaves with 3 reverse heart-shaped leaflets; sepals, petals, and styles each 5; stamens 10.

(Wood Sorrel)

1a. Leaves all basal; flowers white to pink-purple (1-2 dm. high; late spring) --2.

1b. Stem-leaves present; flowers yellow (1-5 dm. high; spring and summer) --3.

2a. Flower-stalks bearing a single flower =Wood Sorrel, Oxalis acetosella.=

2b. Flower-stalks bearing an umbel of several flowers =Wood Sorrel, Oxalis violacea.=

3a. Stem prostrate and creeping Wood Sorrel, Oxalis repens.

3b. Stem erect or ascending --4.