PURSLANE FAMILY 81 



stem-leaves sessile; flowers pink. 3. C. rosea. 



Sepals riaombic-ovate ; conns with several stems. 4. C. mulliscapa. 



Stem-leaves broadly lanceolate, distinctly triple-ribbed. 5. C. lanceolata. 



Plants with a short caudex and a fleshy taproot ; basal leaves clustered. 6. C. megarrhiza. 



3. LIMNIA L. Spanish Lettuce, Squaw Lettuce, Souaw Cabbage, 



Miners' Lettuce. 



Plants with perennial scaly rootstocks; stem-leaves not united. 1. L. asarifalia. 



Plants annual, or perennial by offsets. 

 Stem-leaves free; bractlets present. 



Stem-leaves rounded or rhombic-ovate. 2. L. sibirica. 



Stem-leaves linear. 3. L. arcnicola. 



Stem-leaves more or less united; bractlets lacking, or only one below the lowest pedicel. 

 Stem-leaves broadly ovate to orbicular. 



Blades of the basal leaves reniform or rhombic to spatulate. 



Racemes elongate; flowers more or less fascicled; seeds about 2 mm. long. 



4. L. perfoliata. 

 Racemes short, only slightly exceeding the subtending leaves; seeds about 

 1 mm. long. 5. L. depressa. 



Blades of the basal leaves linear to spatulate; seeds 1 mm. long or less. 



Racemes elongate. 6. L. parviflora. 



Racemes very short. 



Stem-leaves 1-2 cm. long; seeds minutely muricate. 7. L. utahensis. 



Stem-leaves less than 1 cm. long; seeds conspicuously granulated. 



8. L. spalhulata. 

 Stem-leaves linear. 9. L. exigua. 



4. CRUNOCALLIS Rydb. Water Spring-Beauty. l. C. Chamissonis. 



5. NAIOCRENE (T. & G.) Rydb. l. N. parvifolia. 



6. MONTIASTRUM (A. Gray) Rydb. i. M. lineare. 



7. LEWISIA Pursh. Bitter-root, Red-head Louisa. i. L. redeviva. 



8. OREOBROMA Howell. Bread-root. 



Bracts neither sepal-like nor closely subtending the calyx. 

 Sepals not erose-denticulate. 



Petals 10-12 mm. long; leaves usually more than 2 mm. wide. 1. O. nevadensis. 



Petals less than 10 mm. long; leaves 2 mm. wide or less. 2. O. minima. 



Sepals erose-denticulate. 3. O. pygmaea. 



Bracts '2, sepal-like and closely subtending the calyx. 4. O. brachycalyx. 



9. EROCALLIS Rydb. l. E. triphylla. 



10. SPRAGUEA Torr. Pussy-paws. 1. s. multiceps. 



11. PORTULACA (Tourn.) L. Purslane, Pussley. 

 Leaf-blades flat, glabrous in the axils or nearly so; petals yellow. 



Stem prostrate; sepals pointed in the bud; seeds obscurely granulate. 1. P. oleracea. 

 Stem ascending; sepals obtuse in the bud; seeds ecliinate-tuberculate. 2. P. reiusa. 

 Leaf-blades terete or nearly so, pilose in the axils; petals red or purple. 3. P. pilosa. 



Family 43. CORRIGIOLACEAE. Whitlow-wort Family. 



1. PARONYCHIA (Tourn.) Adans. Whitlow-wort. 



Flowers solitary; leaves scarcely exceeding the bracts; plants densely pulvinate. 



Leaves elliptic, tliick, not spinulose-tipped. 1. P. pulvinata. 



Leaves linear, chartaceous, spinulose-tipped. 



Leaves straight, ascending ; spinules of the sepals less than 1 mm. long. 



2. P. brevicuspis 

 Leaves arcuate-spreading; spinules of the sepals more than 1 mm. long. 



3. P. sessiliflora. 

 Flowers more or less clustered; leaves much longer than the bracts. 



Plants low and diffuse, less than 1 dm. high; calyx fully 3 mm. long. 



Inflorescence much contracted; bracts exceeding the flowers. 4. P. depressa. 

 Inflorescence more open; bracts shorter than or merely equalling the flowers. 



5. P. diffusa. 

 Plants taller, 1 dm. or more high; stems erect or ascending; calyx 2-2.5 mm. long. 

 Branches of the cymes ascending; calyx about 2.5 mm. long; sepals lanceolate, 



gradually acuminate. 6. P. Jamesii. 



Branches of the cymes divaricate; calyx about 2 mm. long; sepals oblong, abruptly 



acuminate. 7. P. XVardii. 



Family 44. ALSINACEAE. Chickweed Family. 



stipules wanting. 



Capsule opening with twice as many valves or teeth as there are styles; petals deeply 

 2-cleft. 



