No. 622 



Petals United, Often Forming a Distinct Tube, 

 Which May Be Perfectly Symmetrical, or Un- 

 symmetrical and Irregular. Flowers not in Heads 

 as in the Daisy Family, No. 809. 



(Nos. 623-808.) 



There are about 200 species in this group of plants. In all 

 of them the petals are united to form a tube of some sort 

 which may be regular and cylindrical or bell-shaped. In oth- 

 ers, the flower may be very irregular and unsymmetrical, 

 often I -sided, and with an obvious lip. Whether regular or ir- 

 regular, these united petals are known as a corolla, and this 

 term will be used throughout this section of the book. The 

 main divisions are: 



Leaves none, or wanting at flowering time and rarely seen, or 



reduced to tiny scales no. 802 



Leaves obvious 



Leaves wholly basal no. 798 



Leaves mostly on the stem, sometimes a few basal ones 



Leaves opposite, or clustered, or crowded, never alternate 



(2 exceptions, noted) no. 670 



Leaves always alternate (exception noted at) no. 623 



623. Leaves always alternate, except in the Lousewort, No. 

 627. (Nos. 624-669.) 



Corolla regular and symmetrical, not i -sided no. 634 



Corolla irregular and unsymmetrical, often i-sided, or 2-lipped 

 (see Figs. 624-632) 

 Flower bent and S-shaped, arising directly from the ground 



Virginia Snakeroot no. 624 



Flowers not so 



Flower cluster conspicuously i-sided Blue-weed no. 625 



Flower clusters not i -sided 



Stem leaves more or less deeply cut 

 Upper leaves 3-lobed, those near the flowers l)rilliant 



scarlet Painted-cup no. 626 



Upper leaves not 3-lobed, but cut into many segments; 

 204 



