VASCULAR PLANTS OF THE YANGTZE VALLEY 



Stamens alternate with the corolla lobes or more 

 numerous. 

 Fr. fleshy, many-seeded: anthers prolonged in termi- 

 nal tubes and opening at the apex Vaccinium 



Fr. dry or drupaceous, few-seeded: anthers not pro- 

 longed, opening by slits 141. Styracaceae 



19b. Plants herbaceous: fr. a capsule: usually with milky 



juice 167. Campanulaceae 



18b. Lvs. opposite or whorled. 



Stipules present; lvs. often whorled 162. Rubiaceae 



Stipules usually absent; lvs. never whorled. 



Shrubs, parasitic on trees Loranthus 



Shrubs or small trees, rarely herbs, not parasitic 163. Caprifoliaceae 



17b. Herbaceous vines, tendril-bearing: fr. a pepo: lvs. alternate. 166. Cucurbilaceae 

 16b. Fls. in heads subtended by involucres: anthers united into 

 a tube: fr. a cypsela (achene-like fr. from an inferior 



ovary) 169. Compositae 



lb. Corolla irregular. 

 20a. Ovary superior. 



21a. Stamens not borne on the corolla tube; anthers exserted: lvs. 



alternate : f r . a woody capsule Rhododendron 



21b. Stamens borne on the corolla tube. 

 22a. Green color and normal lvs. lacking: herbaceous root- 

 parasites 157. Orobanchaceae 



22b. Green color present: plants not parasitic on roots. 

 23a. Plants aquatic, delicate or marsh herbs with dissected 

 submersed lvs., regarded as carnivorous by means of 



small bladders on the lvs.: fr. a dehiscent capsule. 155. Lentibulariaceae 

 23b. Plants terrestrial, with normal lvs. 

 24a. Lvs. alternate, or the lower opposite: fr. a 2-celled 



many-seeded capsule 153. Scrophulariaceae 



24b. Lvs. opposite, whorled or in a basal rosette. 



25a. Seeds 4 or fewer to each ovary: stems often 4-angled. 

 26a. Ovary deeply 4-lobed, becoming 4 nutlets in fr.: fls. 



mostly in dense axillary fascicles: herbs 151. Labiatae 



26b. Ovary not deeply lobed: infl. mostly terminal. 

 Fr. 2-4 seeded. 



Shrubs or herbs with simple serrate, lobed or 

 pinnatifid lvs.: fr. a berry, a drupe, or 



separating at maturity into 2-4 nutlets 150. Verbenaceae 



Herbs with simple entire lvs.: fr. a 2-4-seeded 



capsule 159. Acanthaceae 



Fr. a 1-seeded nutlet (achene) enclosed by the 

 persistent calyx: a perennial herb with simple 

 coarsely-toothed lvs 160. Phrymaceae 



25b. Seeds numerous. 



Trees and woody vines: stamens 4, didynamous: fr. 

 an elongated dehiscent capsule with numerous 



winged seeds 156. Bignoniaceae 



Herbs or low shrubs. 



Ovary 1-celled: fr. a linear-cylindric capsule: 



stemless herb or low shrub 158. Gesneriaceae 



Ovary 2-4-celled: fr. an oblong capsule, 4-lobed 



18 



