(217) 



5. S. C u L T E R I Anders. Monaiulrous ; 

 aments iii the axils of porsisteiit leaves. — L> . 

 Marin Connty. Spring. 



2. Populus Tonrn. 

 Poplar Cottonwood. 

 Bracts fimbriate, laciniate. — ^^ . 

 1. P. TRICHOCAEPA Torr. & Gray. — h . Ma- 

 rin Connty. Niles. Spring. 



Order 8. PAEIETALES. Ovary 1-celled; 

 placentation parietal; ovules go. 



Family 1. CISTINEiE. 



Calyx 2-seriate; 2 external sepals smaller 

 than the 3 internal, contorted to the left in 

 aestivation, sometimes 0. Petals 5, caducous, 

 contorted to the right in jBstivation. Stamens 

 GO . Ovary free, formed by several connate 

 carpidia; style 1. Fruit a capsule; placenta- 

 tion sometimes apparently axillary, by pla- 

 centae protruding towards the center. 



1. Helianthemum Touru. Eock-Rose. 



Ovary 3-valved. Placenta3 in the middle of 

 the vjdves; each valve more than 2-seeded. 

 Flowers yellow. 



1. H. sc:)PARiuM Nutt. — U' Tamalpaif. 

 Summer. 



Family 2. LOASACE^. 



Calyx-tube more or less connate with the 

 10 



