220 EOSACE^E. 



3. Spiraea LINN*. 



Dichotomom Key to the Formosan Species. 



(1) Flowers in terminal cymes (2) 



Flowers in axillary umbels S. prunifdia. 



(2) Plants more tlian 30 cm. high S. formosana. 



Plants small, less than 20 cm. high, leaves very much smaller 



S. morrisonicda. 



Spiraea formosana HAY ATA (PL XXH.) Materials for a Flora of 

 Formosa p. 88. Branches straight, fulvescent, densely pubescent. Leaves 

 oblong, or oblong-ovate, 4 cm. long, 24 cm. broad, acute at the apex, round- 

 ly acute at the base, duplicately serrulate on the margin, (serrulas callose 

 at the apex), costas and veins impresse above elevated below, primary 

 veins 5 on both sides, nearly straight, ascendent, reaching the apex 

 of the serrulas, nearly glabrous on both sides, pallid-glaucous beneath, 

 petioles 2 mm. long. Terminal cymes 5 cm. long, 8 cm. broad, branches and 

 pedicels pubescent, bracteoles subulate. Calyx broadly campanulate, 1-J- mm. 

 long, 3 mm. broad, 5-lobate, lobes patent, triangular, pubescent outside, 

 glabrous inside. Petals 5, broadly rounded, rounded or slightly emarginate 

 at the apex, obtuse at the base. Stamens 20, exserted, 4 mm. long, inserted 

 on the throat of the calyx. Glands of disc nearly 10, inserted on the throat, 

 broadly narrowed, % mm. long. Carpels 5, subfusiformed, 2^ mm. long, hirsute 

 on the innerside, styles persistent, 1 mm. long. 



HAB. Kandaisan. 



Near Spircea japonica LINN., but differs from it in having duplicately 

 serrated leaves and less hairy smaller calyx ; also near Spiraea betta from 

 which this differs in having ovate acuminate or acute leaves. 



Spiraea formosana HAYATA var. brevistyla HAYATA Materials for a 

 Flora of Formosa p. 89. Calyx-lobes nearly obsolete, or very much obtuse. 

 Carpels ovoid when ripened, 2 mm. long, shortly rostrate at the apex, or 

 not rostrate, glabrous, other things the same as the type. 



HAB. Mt. Morrison. 



