THE FLORA. 



A nalysis of the Genera. 



Involucre just like a calyx, involving a single, large flowi r. Calyx funnel-form 



corolla- like, the limb entire. Four-o-clAck. MIKAB'ILIB. , 



Involucre involving 2-5 small, rose-red flowers. W. S. OXYB'APHUS. 



cvolucre none, or minute bractlets. Flowers minute. S. BOEKHAA'VIA. 



MIRAB'ILIS. Marvel-of-Feru. Four-o-clook. 



1 M. Jala 'pa. Peruvian F. Leaves ovate, subcordate. Fls. stalked, with a mrgt 



border, infinite iu variety of color, opening about 4 o'clock, p. j. f 



2 M. dichotoma. Mexican F. Erect, smooth. Calyx with a small border, t 



8 M. longiflo'ra. Long-fl. F. Diffuse, viscid. Calyx tube downy, very long, i Mex. 



ORDER CIL POLYGONACE^E. Knotweeds. 



Herbs with alternate leaves, swollen joints, and with 

 stipules sheathing the stem above the joints ; flowers racemed, perfect; 

 calyx persistent; sepals 4-6, imbricated, distinct or united at base; 

 stamens 4-12 ; ovary 2 or 3-styled, 1-celled, 1 -seeded in fruit. 



Analysis of the Genera. 



* Calyx 4-parted, regular. Stamens 6. Styles 2 Mountain Sorrel. OXYR'IA. 



* Calyx 6-parted. Stamens 9. Sepals all similar. khubarb. KHKUM. 



* Calyx 6-parted. Stamens 6. Inner sepals larjri. Dock. Sorrel. RrMEX. 



* Calyx 5-parted (irregularly 4-partcd in one species) ... .a 



a Sep., the 3 inner fringed. Fls. solitary. S. Fringe Knotweed. THYSANEI/LA. 



a Sepals not fringed, entire or nearly so b 



o Pedicels solitary. Sep. all open or 3 closed on the fruit. M. S. POLYGONEL'LA. 

 b Pedicels usually clustered. Sepals all closed on the fruit. POLYO'ONDM. I 



b Pedicels clustered in the bract. Sepals all opt-ii. Buckwheat. FAGOPY'RUIC. 



POLYG'ONUM. Enotweed. 



Calyx 5- (rarely 4-) parted, colored or rorolla-like, the sepals all erect 

 and inclosing the fruit. Stamens 4-9. Styles 2 or 8. Nut lens-shaped 

 or 3-cornered. Herbs with swollen, sheathed joints. Flowers small, 

 white, red, or greenish. May- Aug. 



Stems climbing, with reversed prickles. Leaves cordate-sagittate 19, 20 



Stems unarmed, twining. Leaves co*date-liastate.. . .17, 18 



6 Stems erect or decumbent, unarmed. Leaves hnrdly ever cord.ite.... 



