HYDRANGEACEAE (SYRINGA FAMILY) 123 



AA. Calyx white; petals trifid or entire. 



E. Leaves angularly lobed; calyx lobes acute; petals 3-cleft. E. M. diversifolia 

 EE. Leaves not angularly lobed; calyx lobes obtuse. 



F. Petals entire. E. M. micrantha 

 FF. Petals 3-cleft or -parted. 



G. Raceme not secund; midveins of sepals branched; petals 3-cleft, their lobes 



not divaricate. W. C. E. M. trifida 



GG. Raceme secund; midveins of sepals simple; petals 3-parted, their lobes 



divaricate. E. M. stauropetala 



PARNASSIA (GRASS OF PARNASSUS) 



Glabrous, scapose. Leaves palmately veined, the basal petioled; stem 

 leaf i, sessile. Calyx 5-lobed. Petals pale yellow or white. Fertile 

 stamens 5, opposite the sepals; sterile stamens generally many, in a cluster 

 at the base of each petal. Ovary superior or partly inferior, i-celled; 

 placentae 4. (Named by the Greeks after Mt. Parnassus.) 



A. Leaves ovate to broadly oval; petals 16-20 mm. long, not fimbriolate at base; 



sterile stamens 20-24 i n a group. U. P. californica 



AA. Leaves cordate to reniform; petals 8-13 mm. long, very much fibriolate at 



base; sterile stamens 5-9 in a group. W. C. E. P. fimbriata 



HYDRANGEACEAE (SYRINGA FAMILY) 



Shrubs. Leaves opposite, simple, deciduous, 3-veined from the 

 base; stipules none. Sepals 4-10, united below, in sterile flowers 

 often conspicuously enlarged. Petals as many as the sepals. 

 Stamens 8 to many; filaments long. Ovary wholly or partly inferior ; 

 carpels 2-10, united. Capsule urn-shaped to conic or rarely globose. 

 Seeds i to many in each carpel. 



A. Low, spreading or trailing; stamens 10-12 or fewer; ovule and seed only i in 

 each carpel; capsule beakless. W. (Honor of A. W. Whipple, who commanded 

 a survey on the Pacific coast.) Whipplea modesta (WHIPPLEA) 



AA. Tall, erect or spreading; stamens many; ovules and seeds many in each 

 carpel; capsule beaked by the persistent style. PHILADELPHUS (p. 123) 



PHILADELPHUS (SYRINGA) 



Leaves toothed to entire. Flowers perfect. Sepals 4-5, persistent. 

 Petals white, conspicuous. Stamens 25-60. Ovary at least f inferior, 

 3-5-celled. Capsule obovoid, somewhat woody or leathery, loculicidal. 

 Seeds many. (Honor of King Ptolemy Philadelphus, of Egypt.) 



A. Lower leaf surface pubescent all over; styles united for f their length. W. C. 



P. gordonianus 



AA. Lower leaf surface pubescent only on the veins; styles united for | their length 

 or rarely more. E. P. lewisii 



