4 o ' GERANIUM ORDER 



RUTACEAE RUE FAMILY 



Sepals 4-5, often united, petals 4-5, stamens 4-8, ovary 2-celled, style 1, 

 fruit a 2-lobed capsule, or a winged samara ; flowers solitary or in terminal 

 clusters ; shrubs or trees with simple or palmately compound leaves. 



1. Leaves palmate, consisting of 3 leaflets; fruit 



winged Ptelea 



2. Leaves simple; fruit 2-lobed, not winged Thamnosma 



Ptelea Linne 1753. Hoptree 



(Greek name of the elm) 



PI. 4, fig. 5. 



Sepals 4-5, united, petals 4-5, greenish white, stamens 4-5, ovary 2- 

 celled, style 1, fruit round, broadly winged, 1-seeded; rlowers in terminal 

 clusters ; leaves of 3 lance-ovate to obovate leaflets ; shrubs or low trees. 

 Shrub 5-20 ft. high; leaflets 1-3 in. long; fruit 12-20 



mm. wide P. trifolidta 



Thamnosma Torrey 1858 



(Gr. thamnos, bush, osme, odor) 



PI. 4, fig. 6. 



Sepals 4, petals 4, yellow or tinged with purple, stamens 8, ovary 2- 

 celled, style 1, fruit a 2-lobed capsule, with 4-6 seeds in each lobe; flowers 

 solitary ; leaves simple, linear, heavy-scented ; low shrubs. 

 Stems branched at base, 3-12 in. high ; leaves 1-2 cm. 



long T. t ex ana 



LINACEAE FLAX FAMILY 



Sepals 5, petals 5, yellow or blue, falling after a few hours, stamens 5, 

 united below, ovary 4-5-celled, or 8-10-celled by new partitions, styles 5, 

 fruit a capsule opening by 5-10 valves; flowers in cymes or racemes; an- 

 nual or perennial herbs with alternate, opposite or whorled simple entire 

 leaves. 



Linum Linne 1753 Flax 



(Gr. linon, Lat. linum, flax) 



PL 7, fig. 1. 



Characters of the family. 

 1. Flowers blue 



a. Petals 3-4 times, fruit 2-3 times, longer than 



the obtuse sepals L. perenne 



