50 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Division II. GAMOPETALAE. 



Petals present and united, at least at the base. Also called Sympetalae and 

 Metachlamydeae . 



Stamens not more numerous than the lobes of the corolla. 



Plants herbaceous, without chlorophyll . . . .'. Monotropsis (p. 221). 



Plants woody, sometimes low and creeping, with chlorophyll. 



Ovary inferior VACCINIACEAE (p. 224). 



Ovary superior. 



Fruit dehiscent, usually dry; shrubs ; ERICACEAE (p. 222). 



Fruit a large berry with several flat seeds; a tree. .DIOSPYRACEAE (p. 227). 

 Stamens not more numerous than the corolla lobes. 

 Stamens opposite the lobes of the corolla, equaling them in number. 



<a+ am ™, u • v ., , , . , PRIMTJLACEAE (p. 225). 



btamens alternate with the lobes of the corolla or fewer. 



Ovary inferior. 



Tendrils present CUCURBITACEAE (p. 262). 



Tendrils none. 

 Stamens united by their anthers. 



Flowers separate, not involucrate LOBELIACEAE (p. 263). 



Flowers in dense heads surrounded by an involucre. 

 Corolla strap-shaped in all the flowers of the head. Juice milky; leaves 



alternate CICHORIACEAE (p. 263). 



Corollas all tubular, or only the outer ones strap-shaped. 

 Flowers unisexual, the 2 kinds in separate unlike heads; involucre 

 of the pistillate heads coriaceous and spiny or tuberculate, forming 

 a bur inclosing the achenes; ray flowers none. Flowers greenish 



or yellowish AMBROSIACEAE (p. 267). 



Flowers all perfect, or both kinds in the same head or rarely in separate 



heads, but the heads then all similar in general appearance (except 



in Baccharis); involucre not coriaceous and spiny, not inclosing 



the achenes as a bur; ray flowers usually present. 



Stamens distinct. ASTERACEAE (p. 268). 



Leaves alternate; stamens free from the corolla or nearly so. Juice milky. 



CAMPANULACEAE (p. 262). 

 Leaves opposite or whorled; stamens inserted on the corolla. 

 Stamens 1-3, fewer than the corolla lobes. Ovary consisting of a fertile 

 1-ovuled cell and 2 empty or abortive cells; herbs, without, stipules. 



a* VALERIANACEAE (p. 261). 



Stamens 4 or 5. 



Ovary 1-celled. Flowers in dense involucrate heads; herbs, without 



stipules... DIPSACACEAE (p. 262). 



Ovary 2-5-celled. 

 Leaves without stipules (except Viburnum pubescens), opposite. 



CAPRIFOLIACEAE (p. 259). 



Leaves with stipules, or whorled RUBIACEAE (p 257) 



Ovary superior. r '' 



Plants woody. 

 Leaves opposite. 



Corolla irregular; fruit a capsule BIGNONIACEAE (p. 254) . 



Corolla regular; fruit indehiscent, dry or fleshy OLEACEAE (p. 227). 



Leaves alternate. 



Ovary 2-celled; fruit a berry Lycium (p. 247). 



Ovary 3- 10-celled; fruit a dry (or Bometimes fleshy) capsule. 



ERICACEAE (p. 222). 



