354 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Flowers not in racemes; petals entire. 

 Stamens 5. 



Lowest leaves divided to the base into 3 lobes 3. HEMIEVA. 



Lowest leaves (like the upper ones) shallowly lobed or toothed. 



Rootstocks with bulblets; flower stems leafy; flowers in a loose open panicle. 



4. SUKSDOEFIA. 

 Rootstocks without bulblets; flower stems not leafy; flowers in a dense spilie- 



like panicle 5. HETTCHEEA. 



Stamens 10. 

 Fruit 1-celled; leaves broadly heart-shaped; flowers white, in a loose panicle. 



6. TIARELLA. 



Fruit 2-celled; leaves and flowers various. 



Leaves leathery; fruit of 2 distinct pods 7. LEPTARRHENA. 



Leaves thin or fleshy, not leathery; fruit of 2 united pods . 8. SAXIFRAGA. 



1. LITHOPHRAGMA Nutt. 



1. Lithophragma parviflora (Hook.) Nutt. Woodland star. East entrance, in 

 woods, Umbach. B. C. to Calif., Colo., and S. Dak. — Stems slender, 10 to 30 cm. 

 high, leafy, somewhat hairy; lobes of the leaves again lobed, 1 to 3 cm. long; flowers 

 few, the petals white, 7 to 8 mm. long, 3 or 5-cleft; stamens 10. 



2. MITELLA L. Miterwort. 



Perennials with rootstocks; leaves basal, long-petioled, heart-shaped or kidney- 

 Bhaped, shallowly toothed and lobed; petals 5 or none; stamens 5 or 10. — The capsule 

 opens widely and exposes the black seeds which lie within, like eggs in a nest. 



Petals 3-cleft near the apex, white or purplish; stamens 5, opposite the sepals. 



1. M. violacea. 

 Petals pinnately lobed, greenish or yellowish; stamens 5 or 10. 



Stamens 10; rootstocks very slender 2. M. nuda. 



Stamens 5; rootstocks short and thick. 



Stamens opposite the petals 3. M. pentandra. 



Stamens opposite the sepals 4. M. breweri. 



1. Mitella violacea Rydb. Occasional on the east slope at all altitudes, on open 

 slopes or cliffs or in moist woods. Mont. {Ozomelis violacea Rydb.) — Rootstocks 

 thick; leaves 2 to 4 cm. long, shallowly lobed, hairy; flower stems slender, 10 to 30 

 cm. high; petals twice as long as the sepals. 



2. Mitella nuda L. Mossy banks in swampy woods below Lake McDermott. 

 B. C. and Mont, to Lab.; also in Asia. — Plants producing long runners; leaves 2 to 

 5 cm. wide, only slightly lobed, hairy; stems 5 to 20 cm. high. 



3. Mitella pentandra Hook. Common at middle and high altitudes, on open 

 elopes or in meadows or deep woods. Alaska to Calif., Colo., and Alta. (Pectianthia 

 pentandra Rydb.) — Leaves 3 to 8 cm. wide, very shallowly lobed, sparsely short- 

 hairy; stems 10 to 40 cm. high; petals with threadlike lobes. 



4. Mitella breweri A. Gray. Common above and near timber line, in woods or on 

 open slopes. B. C. to Calif., Mont., and Alta. (Pectianthia breweri Rydb.) — Leaves 

 4 to 7 cm. wide, shallowly lobed, slightly hairy; stems 10 to 30 cm. high; flowers 

 green. 



3. HEMIEVA Raf. 



1. Hemieva ranunculifolia (Hook.) Raf. On moist cliffs or damp rocky slopes; 

 Altyn Peak, Grinnell Glacier, Baring Falls. B. C. to Oreg., Mont., and Alta. — 

 Plants with bulblike rootstocks, 10 to 20 cm. high, with scattered gland-tipped hairs; 

 basal leaves stalked, 1 to 2.5 cm. long, divided to the base into 3 broad lobes, these 

 3 or 4-lobed; upper leaves 3-lobed; flowers in a loose panicle; petals white, short- 

 clawed, persisting in fruit. 



