84 KEY AND FLORA 



or 2, narrowed at each end, jxrojecting from the calyx, bat the 

 style not becoming longer in fruit. 



P. tridenta'ta. Leaves 3-lobed at apex, covered with white down 

 on the under surface. Calyx also downy. This is common in the 

 lower mountains, especially on the eastern side of the Sierra Nevada 

 Mountains. Late spring. 



VI. ADENOS'TOMA, Chemisal, Greasewood 



Evergreen shrub with linear, resinous leaves. Flowers 

 small, white, in panicles. Calyx with a 10-ribbed tube and 

 broad, membranous lobes. Petals 5, round. Stamens gen- 

 erally from 10 to 15 m clusters between the petals. Fruit 

 1-seeded, included in the calyx tid)e. 



a. A. fascicula'tum Hook. & Arn. Chemisal, Greasew^ood. 



Stems many, the slender, reddish branches covered with close clus- 

 ters of very small, heather-like leaves ; stipules small, acute. Flowers 

 crowded, nearly sessile. This often exclusively covers acres, usually 

 growing on dry hills. 



b. A. sparsifo'lium Torr. Yerba del pasmo. Tree or shrub 

 tvith narroioly linear, scattered leaves, loithout stipules. Flowers larger 

 than the preceding, on distinct pedicels. This is found in southern 

 California. It is very fragrant, and much used as a remedy for 

 colds by the Indians. 



VII. GE'UM, Avens. 



Perennial herbs. Leaves chiefly radical, pinnately divided, 

 with petioles sheathing the stem and stipules attached. 

 Flowers about as large as a nickel, solitary or generally in 

 corymbs. Calyx open-bell-shaped, valvate in bud, with bract- 

 lets between the lobes. Petals 5, purplish or yellow. Cai^- 

 pels very numerous, on a dry receptacle^ the style becoming long ; 

 in fruit either bent in the middle or feathery. 



a. G. macrophyrium VAlld. Stems 1-3 ft. high, hairy. Leaves with 

 the largest division at the tip. Corolla yellow, with broad lobes 

 longer than the sepals. Receptacle of the fruit smooth. Styles hent 

 near the middle, the upper part falling, leaving the lower part hooked. 

 In the mountains. Summer. 



b. G. stric'tum Ait. Similar to the preceding but less hairy. Recep- 

 tacle of fruit downy instead of smooth. In the mountains. 



