PURSLANE FAMILY 



81 



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



Sepals rhombic-ovate; corms with several stems. 4. C. muUiscapa. 



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. 



1. L. asarifolia. 



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

 Plants annual, or perennial by ofllsets. 

 Stem-leaves free; bractlets present. 



Stem-leaves rounded or rhom.bic-ovate. 2. L. sibirica. 



Stem-leaves linear. 3. L. arenicola. 



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. perfoUata. 

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



1 mm. long. 5. L. depressa. 



Blades of the basal leaves Unear 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. h. ulahensis. 



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



5. L. spathulata. 

 Stem-leaves linear. 9. L. exigua. 



4. CRUNOCALLIS Rydb. Water Spring-Beauty. 



5. NAIOCRENE (T. & G.) Rydb. 



6. MONTIASTRUM (A. Gray) Rydb. 



7. LEWiSIA Pursh. Bitter-root, Red-head Louisa. 



8. OREOBROMA Howell. Bread-root. 



Bracts neither sepal-Uke nor closely subtending the calyx. 

 Sepals not erose-denticulate. 



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

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

 Sepals erose-denticulate. 

 Bracts 2, sepal-like and closely subtending the calyx. 



1. C. Chamissonis. 

 1. N. parvifoHa. 

 1. M. lineare. 

 1. L. redeviva. 



1. O. nevadensis. 



2. O. minima. 



3. O. pygmaea. 



4. O. brachycalyx. 



1. E. triphylla. 



1. S. multiceps. 



1. P. oleracea. 



2. P. Teiusa. 

 P. pilosa. 



3. 



9. EROCALLIS Rydb. 



10. SPRAGUEA Torr. Pusst-paws. 



11. PORTULICA (Toura.) L. Pobslanb, Pcsslby. 

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



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

 Stem ascending; sepals obtuse in the bud; seeds echiuate-tuberculate. 

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



Family 43. CORRIGIOLACEAE. Whitlow-woet Family. 



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



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



Leaves elliptic, thick, 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 diflluse, 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 theHowers. 



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. Wardii. 



Family 44. ALSINACEAE. Chickweed Family. 



stipules wanting. , ^ , ,, ^ , ^ , j , 



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

 2-creft. 



