SUMACH, ETC. 301 



Flowers polygamous, hypogynous, small, greenish- 

 yellow, crowded in large terminal and axillary pyramidal 

 panicles, which in fruit become densely felted with dark 

 purple tomentum. Honey exposed, entomophilous. 



Calyx fused beneath to a broad fleshy hypogynous disc, 

 5-partite, persistent, segments imbricate in bud. Petals 5, 

 small, but longer than sepals; inserted outside the disc; 

 imbricate. Stamens 5, inserted beneath the disc ; fila- 

 ments subulate, anthers ovoid. Almost rudimentary in 

 some flowers and barren, rendering the flowers $ . Ovary 

 ovoid, single, free, 1 -chambered with one ovule, and 3 styles 

 ending in blunt stigmas. Fruit small, like a dry drupe. 

 Pollen large, ellipsoid, with 3 folds and striate. 



(ii) Flowers not hypogynous, the stamens and 

 petals being inserted on the calyx, or on a 

 disc lining the calyx-tube (perigynous), or 

 carried up on the throat of the calyx-tube 

 to a level above the ovary (epigynous). 



(a) Floivers zygomorphic, papilionaceous ; L^or (/3) 

 petals 5, the posterior the larger (stand- 

 ard) and folded in bud over the tiuo 

 laterals {alee) luhich in their turn cover 

 the small anterior boat-shaped carina: 

 stamens 10, united all, or 9 only, into 

 a tube; carpel 1, ripening into a legume 

 (Leguniinosce). 



* The posterior stainen free, the other 

 nine united; calyx campanulate, slightly 

 3-toothed ; flowers white, in pendent 

 racemes. 



Robinia pseudacacia, L. False Acacia (Figs. 118, 119). 

 Tree, with pinnate leaves and pulvinar spines; bearing 



