114 S AXIFRAGACE AE 



Panicle wide; peduncles of the lower cymules elongate. 



Petals with claw-like 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. M. 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 elhptic-oblong or ovate blades, the claws stout. 15. M. aestivalis. 

 Petals with suborbicular or reniform blades, the claws slender. 



16. M. 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 

 bi anch of the stem. 2. S. Brunoniana. 



Inflorescence without bulblets. 3. S. ferruginea. 



21. LEPTARRHENIA R. Br. 1. L. pyrolifolia. 



23. LEPTASEA Haw. Yellow 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. Z.. Hirculus. 

 Leaf-blades spine-tipped ac the apex. 



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

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



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



caudices. 3. £,. Van-Bruntiae. 



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



the caudices. 4. L. auslromoniana. 



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



Petals broadly obovate; ;dants with runners producing an offset at the end! 



6. i. flagillaris. 



23. HETERISIA Raf. l. H. Mertensiana. 



24. ANTIPHYLLA Haw. Purple or Mountain Saxifrage. 



1, A. oppositifolia. 



Family 58. HYDRANGEACEAE. Hydrangea Family. 



Capsule obovoid or obconic, the beaks rising abruptly from the body. 



1. Philadelphus. 

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

 Filaments and anthers unappendaged; sepals and petals 5. 



Leaf-blades toothed; hypanthium short during anthesis. 2. Edwinia. 



Leaf-blades entire; hypanthium long during anthesis. 3. Fbndleeella. 



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

 and petals 4. 4. fendleba. 



1. PHILADELPHUS L. Mock Orange, Syringa. 



Leaf-blades thin, not leathery, usually toothed or denticulate, 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-rlbbed 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 



T „ .,,°?' I .,,._ J i, .,_ . • i. ^ , , 3. P. columbianus. 



Leaf-blades 5-ribbed, aU ribs origmating at the base of the blade. 



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



Hypanthium 4-5 mm. high . , , . 5. P. microphyllus. 



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



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



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



7. P. minutus. 



