(39) 



3. Cborizanthe. — Involucre 1-3-flowerecl, 

 tubular. Styles 3. Fruit an akene. 



DECANDRIA. 

 I. Monogynia. 



A. Corolla J^-5 petalous, or 2^ctals 0. Never 

 gamopetaloiis. 



1. Pyrola. — Calyx 5-parted, persistent. 

 Hypogynous disc 0. Anthers dehiscent 

 by 2 pores. Seeds minute. 



2. Cercis. — Calyx scarcely dentate. Corolla 

 papilionaceous. Anthers versatile. Pet- 

 als unguiculate, carina 2-petalous, larger 

 than the upper petals. Legume flat oo- 

 seeded. Ventral suture winged. Shrub. 

 Tree. 



3. Thermopsis. — Calyx cleft to the middle. 

 Corolla papilionaceous. Petals of the 

 carina partly connate, longer than vexil- 

 lum. Legume linear, compressed. 



4. Pickeringia. — Calyx repandly 4-dentate. 

 Corolla papilionaceous. Carina 2-peta- 

 lous, as longasvexillum. Legume linear, 

 compressed. Shrub. 



5. Geranium. — Carpidia 5, verticillate 

 around a columnar axis. Styles connate 

 at the apex. Stamens all fertile. 



6. Erodium. — Carpidia 5,. verticillate 



