W: 



SAXIFRAGACEAE (SAXIFRAGE FAMILY) 445 



1. A. biternita (Vent.) Britton. Somewhat pubescent (1-2 m. Ingli); leaf- 

 lets mostly heart-shaped; petals minute or wanting in the fertile flowers; 

 stamens 10. {A. decandra Don.) — Mt. woods, s. e. Ky. (Kearney) and s. w 

 Va. to N. C. and Ga. — Closely imitating Arunciis sylvester, but coarser. 



2. SULLIVANTIA i . & G. 



Calyx bell-shaped, adhering below only to the base of the ovary, 5-cleft. 

 Petals 6, oblanceolate, entire, acutish, withering-persistent. Stamens shortei 

 than the petals. Capsule 2-beaked, many-seeded, opening between the beaks ; 

 seeds imbricated upward. — Low and reclined-spreading perennial herbs with 

 rounded and cut-toothed or slightly lobed smooth leaves on slender petioles, 

 and small white flowers in a branched loosely cymose panicle raised on a nearly 

 leafless slender stem (1.5-4 dm. long). Peduncles and calyx glandular; pedicels 

 recurved in fruit. (Dedicated to the distinguished bryologist William Starling 

 SuUlvant^ who discovered our species.) 



1. S. Sullivantii (T. & G.) Britton. {S. ohionis T. & G.) — Limestone cliffs, 

 O. and Ind. to la. and Minn. June. 



3. BOYKINIA Nutt. 



Calyx-tube top-shaped, adherent to the 2-celled and 2-beaked capsule. Sta- 

 mens 5, as many as the deciduous petals, these mostly convolute in the bud. 

 Otherwise as in Saxifraga. — Perennial herbs, with alternate palmately 5-7-lobed 

 or cut petioled leaves, and white flowers in cymes. (Dedicated to the late Dr. 

 Boykin of Georgia.) 



1. B. aconitifblia Nutt. Stem glandular (2-6 dm. high); leaves deeply 

 6-7-lobed. ( Therofon Millspaugh.) — Rocky banks, W. Va. (ace. to Millspaugh) 

 and mts. of Va. to Ga. and Tenn. July. 



4. SAXIFRAGA [Tourn.] L. Saxifrage 



Calyx either free from or adhering to the base of the ovary, 5-cleft or 

 parted. Petals entire, imbricated in the bud, commonly deciduous. Styles 2. 

 Capsule 2-beaked, 2-celled, opening down or between the beaks, or sometimes 

 2 almost separate follicles. — Chiefly perennial herbs, with the root-leaves clus- 

 tered, those of the stem mostly alternate. (Name from saxiim, a rock, and 

 frangere, to break ; many species rooting in the clefts of rocks.) 



Acaulescent, the principal leaves in a basal rosette ; scapes naked below 

 the inflorescence. 



Flowers niostly replaced by leafy tufts 1. /S. stellaris, v. comosn. 



Flowers all perfect. 

 Sepals reflexed. 

 Leaves conspicuously and coarsely dentate. 



Petals unequal ; follicles strongly ribbed 2. S. leucanihemifolia. 



Petals uniform ; follicles obscurely or not at all ribbed. 

 Leaves abruptly contracted to long petioles .... 8. S. carolinhtna. 



Leaves gradually narrowed to the base 4. & micranihidifolia. 



Leaves finely or sha'Howly crenate-dentate. 



Leaves membranaceous, pilose beneath h. 8. Forhenii. 



Leaves leathery, glabrate beneath . &. S. penuxylvanica. 



Sepals ascending. 



Petals white, exceeding the sepals 7. .<5'. rirginietisiK. 



. Petals green, much shorter than the sepals, or wanting (7) i.*?. rirgitnenifis, v. chlorantha 

 Caulescent tufted or matted plants, branching at base, the flower- 

 ing branches mostly leafy below the inflorescence. 

 Leaves with 8-5 lobes or coarse teeth. 



Leaves (basal) rounded, on slender petioles B. S. rivnlnris. 



Leaves gradually narrowed to the base, rigid, with 3 sharp teeth . 9. S. trif^uspidata. 

 Leaves entire or with regularly many-toothed or ciliate iiiargiiis. 

 Leaves linear-lanceolate, entire (sometimes sparingly ciliate), alter- 

 nate ; flowers yellow - .... 10. S. aizoides. 



Leaves toothed or "ciliate. 

 Leaves mostlv in basal rosettes ; scapes upright, bearing numerous 



whitish fl"owers 11. 5. Aizoon. 



Leaves crowded and opposite along the matted branches ; flowers 



soUtary, purple < . 12. 5. cppoHUfoJia. 



