RUBIACEAE 



571 



I. G. tricorne. 



G. Aparine. 

 G. triflorum. 



4. G. pilosum. 



5. G. boreale. 



6. Galium L. 



I. Fruit dry. 

 Fruit bristly, granular or tubcrcled. (Becoming glabrous in No. 5). 

 Leaves in 6's or 8's. 



Fruit granular or tubercled, not bristly; ballast plant. 

 Fruit bristly. 



Angles of stem retrorse-hispid; leaves in 6's or 8's; 



fruit 4-6 mm. broad. 

 Stem glabrous; leaves in 6's; fruit 3-4 mm. broad. 

 Leaves in 4's. 



Leaves i-nerved. 

 Leaves 3-nerved. 



Leaves linear to linear-lanceolate; flowers in ter- 

 minal panicles. 

 Leaves lanceolate or ovate; flowers in open cymes. 

 Upper leaves ovate, obtuse. 

 Upper leaves lanceolate, acuminate. 

 Fruit smooth and glabrous. 



Flower yellow; leaves in 6's or 8's; fruit about 2 mm. broad. 

 Flower greenish-white or white. 



Leaves in 4's or fewer than 4's. 



Flowers several in small dichotomous cymes. 

 Flowers solitary or in a simple cyme. 



Leaves spreading or ascending; fruit about 



3 mm. broad. 

 Leaves mostly rcflexcd; fruit I— 1.5 mm. broad. 

 Leaves in 5's or more than 5's or in 4's in G. Clayloni. 

 Plants erect; stems and leaves smooth, or nearly so. 

 Flowering branches and pedicels strongly di- 

 varicate. 

 Flowering branches and pedicels mostly ascend- 

 ing. 

 Plants decumbent, forming dense mats; stems and 

 leaves scabrous. 

 Leaves acute or cuspidate. 



Leaves linear, slightly upward scabrous on 



the margin. 

 Leaves lanceolate, retrorse-scabrous. 

 Leaves obtuse. 



Flowers solitary or in simple cymes. 

 Flowers several in a small dichotomous 

 cyme. 



II. Fruit fleshy. 



1. G. tricorne Stokes. In waste or cultivated fields: Ont. and 



about the eastern seaports. Native of Europe. 

 Rare as an occasional waif in our range. 



2. G. Aparine L. In various situations: N. B. to S. Dak., Fla., 



Mo. and Tex. Apparently naturalized from Europe, in part. 

 Common as a weed in most parts of our range. 



12. G. MoIIuro. 



13. G. erectum. 



14. 

 15- 



G. concinnum. 

 G. asprellum. 



16. G. Clayloni. 



9. G. paluslre. 



17. G. bermudense. 



