26 LINACEAE. 



TILIA L. Linden. Basswood. Sepals 5, petaloid. Petals 5, oblong-, obtuse. 

 Each set of stamens with a petaloid scale at the base. Pistil 1. Ovary 

 superior, 5-celled, each cell 2-ovuled. Fruit dry, becoming by abortion 1-celled, 

 1-2-seeded. 



T. americana L. Tree 40-70 feet high ; wood white, soft; leaves alternate, 

 broadly ovate, pointed, sharply serrate, base cordate; stipules deciduous; 

 flowers cream colored, fragrant, appearing after the leaves, in axillary 

 cymes; pecuricles hanging and united to a ligulate membranaceous bract; 

 fruit ovoid. Rich woods; July; frequent, widely distributed. 



LINACEAE Dumort. Flax Family. 



Herbs, with alternate simple leaves, and perfect regular flowers. 

 Stipules none or gland-like. Sepals 4-5, imbricated, persistent. Petals 

 4-5, hypogynous, imbricated, usually contorted. Stamens as many as 

 the petals and alternate with them. Styles 3-5. Ovary 4-5-celled, with 

 2 ovules in each cell. Capsule globose. 



LINUM L. Fi,ax. Herbs, with fibrous bark and sessile leaves. All parts of 

 the flower in 5's, each series regularity alternate with the preeeeding. Cap- 

 sule 5-eelled, breaking into 5 carpels in dehiscence, each cell wholly or partly 

 divided by a false partition. Cells with 2-suspended mucilaginous seeds. 



L. usitatissimum L. Common F. Annual, stem terete, striate, erect, 1-2 

 feet high, much branched; leaves lanceolate, sessile; stipules none; flowers 

 blue, axillary; sepals lanceolate, ciliate; petals twice the length of the sepals, 

 crenulate; capsule globular. Spontaneous in fields and waste places, June- 

 August; infrequent. 



L. sulcatum Riddell. Annual, erect, 1-2 feet high, somewhat branched 

 above, stem and branches narrowly wing-angled and grooved; leaves lanceo- 

 late or linear; stipules a pair of dark colored glands; flowers yellow; sepals 

 acuminate, glandular ciliate, 1-nerved; styles united below the middle. Dry 

 soil, prairies; June-August; common. 



L. rigidum Pursh. Probably perennial, glaucous, glabrous or puberulent; 

 branches rigid, more or less angular; upper leaves and sepals glandular-ser- 

 rulate. Loess hills; Woodbury and Fremont counties; frequent. 

 GERANIACEAE ./. St. Hil. 



Herbs, with alternate or opposite leaves, and perfect hypogynous 

 regular or irregular flowers. Parts of the flower usually in 5's. Stamens 

 as many ok twice as many as the sepals, some often rudimentary. Ovary 

 5-celled, each cell 2-ovuled, beaked with the compound style. 



GERANIUM L. Herbs, with stipulate palmately lobed leaves and axillary 

 t-3 flowered peduncles. Sepals and petals 5, regular, the sepals imbricated 

 in the bud, persistent. Stamens usually 10, the 5 alternate ones longer, and 

 provided with glands at their bases, alternate with the petals. Ovary deeply 

 5-lobed. 5-celled, separating into 5, 1-seeded long-tailed carpels from a persist- 

 ent axis. 



G. maculatum L. Wild Cnmc's-blll. Perennial, from » thick rootstock: 

 stem 1-3 feet high, erect, hairy, branching above; leaves usually 5-parted, 

 divisions cuneate toward the base, incisely lobed or toothed above, root- 

 leaves on long petioles; flowers light purple, sepals ovate, pointed; petals en- 

 tire, broadly oval, bearded on the claw. Rich woods; May-July; common. 



G. carolinianum L. Root annual; stem 5-14 inches high, much branched, 

 hairy; leaves about 5-parted, divisions cut into narrow lobes; flowers clus- 



