114 SAXIFRAGACEAE 



Panicle wide ; peduncles of the lower cymules elongate. 



Petals with claw-Uke bases. 7. M. arnoglossa. 



Petals without claw-like bases. 8. M. oregana. 



Panicle narrow; peduncles permanently very short. 9. M. brachypus. 

 Petals greenish. 10. M. montanensis. 



Corolla wanting or obsolete. 11. A/, subapetala. 



Filaments clavate or spatulate. 



Leaf-blades flabellate. 12. M. Lyallii. 



Leaf-blades ovate, oval, broadly oblong, or orbicular. 



Leaf-blades narrowed at the base, neither cordate nor of an orbicular type. 



Cymules permanently compact. 13. M. occidentalis. 



Cymules lax and open. 14. M. saximontana. 



Leaf-blades orbicular or nearly so. 



Petals with elUptic-oblong or ovate blades, the claws stout. 15. M. aeslivalis. 

 Petals with suborbicular or reniform blades, the claws slender. 



16. ^f. arguta. 



20. SPATULARIA Haw. Saxifrage. 



Inflorescence with bulblets. 



Plants with all the flowers represented by clusters of bulblets, or with a single flower 



terminating the main axis. 1. S. Vreelandii. 



Plants with many flowers and some bulblets, at least with a flower terminating each 

 branch of the stem. 2. S. Brunoniana. 



Inflorescence without bulblets. 3. S. ferruginea. 



21. LEPTARRHENIA R. Br. l. L. pyrolifolia. 



23. LEPTASEA Haw. Ykllow Saxifrage, Spotted Saxifrage. 



Leaf-blades not spine-tipped at the apex, more or less ciliate. 



Petals suborbicular or oval, 5.5-7 mm. long, each abruptly narrowed into a short 



claw: plant less than 6 cm. high. 1. L. chrysantha. 



Petals elliptic to oblong, 9-13 mm. long, clawless; plant more than 6 cm. high. 



2. L. Hirculus. 

 Leaf-blades spine-tipped ac the apex. 



Petals oblong, oblong-lanceolate, oval, or elliptic; plants without runneis. 

 Leaf-blades entire, ^vith a single spine at the apex. 



Leaf-blades not ciUate, fleshy; flower-stalks bearing larger leaves than the 



caudices. 3. L. Van-Bruntiae. 



Leaf-blades ciliate, parchment-like; flower-stalks bearing smaller leaves than 



the caudices. 4. L. auslromontana. 



Leaf-blades 3-toothed at the apex, the teeth spine-tipped. 5. L. tricuspidata. 



Petals broadlj- obovate; plants with runners producing an offset at the end. 



6. L. flagillaris. 



23. HETERISIA Raf. l. H. Mcrtensiana. 



24. ANTIPHYLLA Haw. Purple or ^Mountain S.\xifrage. 



1. .A. opposilifolia. 



Family 5S. HYDRANGEACEAE. Hydraxgea Family. 



Caosule obovoid or obconic, the beaks lising abruptly from the body. 



1. Philadelphus. 

 Capsule conic or ovoid, the beaks tapering gradually from the body. 

 Filaments and anthers unappendaged: sepals and petals 5. 



Leaf-blades toothed; hypanthium short dming anthesis. 2. EnwiNiA. 



Leaf-blades entire: hypantliium long during anthesis. 3. Fexdlerell.\. 



Filaments appendaged under the anthers; anthers appendaged at the top: sepals 

 and petals 4. 4. Fexdlera. 



1. PHILADELPHUS L. Mock Orange, Syringa. 



Leaf-blades tliin, not leathery, usually toothed or dentictilate, more than 3 cm. long; 

 flowers several. 

 Petals ovate-lanceolate, acute or obtuse at the apex. 1. P. Helleri 



Petals oblong to rounded-oval; rounded at the apex. 



Leaf-blades 3-5-ribbed, the lateral ribs or if 5-ribbed the second or stronger pair 

 meeting the midrib some distance from the base of the blade. 

 Bark of the second season red or chestnut-brown, with conspicuous cross- 

 cracks, at last peeling off. 2. P. Lewisii. 

 Bark of the second season gray or yellowish, neither cross-cracked nor peeling 

 off. 3. P. columbianus. 

 Leaf-blades 5-ribbed, all ribs originating at the base of the blade. 



4. P. Gordonianus. 

 Leaf-blades small, 0.5-2 cm. long, entire; flowers mostly solitary. 



Hypanthium 4-5 mm. high. 5. P. inicrophyllus. 



Hypantliium about 2 mm. high, or in fruit 3-4 mm. high. 



Styles wholly united or nearly so; stigmas sometimes also partly united. 



6. P. occidentalis. 

 Styles distinct for at least half their length; stigmas distinct. 



7. P. minutus. 



