156 



HYPERICACE.IE 



Family S2. HYPERICACEAE. St. John's-wort Family. 



1. HYPERICUM (Tourn.j L. St. Johx's-wort. 



Petals more than twice as long as the sepals, both usually margined with black glands; 

 stamens numerous; erect perennials. 

 Sepals acuminate or at least decidedly acute. 1. H. formosum. 



Sepals obtuse or acutish. 



Stem 3-3 dm. high; petals 8-10 mm. long. 2. H. Scouleri. 



Stem about 1 dm. liigh; petals 10-15 mm. long. 3. H. NoTtonae. 



Petals slightly exceeding the sepals; black glands none; stamens 5-20; annuals or no. 4 

 often peremiial, rooting at the nodes. 

 Procumbent, often forming mats; leaves broadly oval. 4. H. anagalloides. 



Erect and simple; leaves oblong to lanceolate. 5. H. majus. 



Family S3. ELATINACEAE. Water-wort Family. 



1. ELATINE L. Water-wort, Mud-purslane. 



Flowers sessile; stamens 2-3, as many as the petals. 



Leaves oblanceolate; flowers usually 3-merous. 1. E. triandra. 



Leaves obovate. 



Flowers 3-merous; plant red; leaves 2 mm. long. 2. E. rubella. 



Flowers 2-merous; plant green; leaves 4-6 mm. long. 3. E. americana. 



Flowers pedicelled; stamens 6-8, twice as many as the sepals and petals. 



4. E. Williarnsii. 



Family S4. FRANKENIACEAE. Fr.\xke.\ia Family. 

 1. FRANKENIA L. l. F. Jamesii. 



Family So. CIST ACE AE. Rock-rose Family. 

 1. CROCANTHEMUM Spach. Frost-weed. i. C. majus. 



Family 86. VIOLACEAE. Violet Family. 



Sepals auricled at the base; coroUa spurred. 1. Viola. 



Sepals not aiu-icled at the base; lowest petal merelj' saccate at the base. 2. Calceol.\ria. 



1. VIOLA (Tourn.) L. Violet, Heart.s-ease, Pansy. 



Plants acaulescent, or without manifest stems. 

 Plants without stolons. 

 Flowers violet-puiple. 

 Rootstock tliick. 



Leaves not lobed nor parted. 

 Leaves and scapes glabrous. 



Spurred petal glabrous, rounded at the apex. 



Pedimcles of cleistogamous flowers usually 1-3 cm. long, pros- 

 trate under the soil or dead leaves. 1. V. papilionacea. 

 Peduncles of cleistogamous flowers usually 4-6 cm. long, erect 

 or ascending. 2. V. pratincola. 

 Spurred petal more or less bearded, retuse or emarginate. 

 Spiured petal somewhat bearded, mostlj" retuse. 



3. V. retusa. 

 Spurred petal tliickly bearded, emarginate. 4. 

 Leaves and scapes liirsutulous. 5. 



Leaves 2-3-ternately parted. 6. 



Rootstock slender. 7. 



Flowers wliite. 8. 



Plants stoloniferous. 

 Flowers not yellow. 



Flowers wliite or lilac; petioles glabrous. 9. 



Flowers white; petioles after flowering pilose. 10, 



Flowers yellow. 



Stolons several, long, prostrate, leafy. 

 Stolons few, short, ascending, with 1-3 leafy bracts. 

 Plants caulescent, or with manifest stems. 

 Leaves compound or much dissected. 



Upper petals deep violet, the lower pale violet, with yellow base. 



13. V. Bcckwithii. 

 All the petals pale yellow. 14. V. Sheltonii. 



Leaves simple, not dissected. 

 Flowers yellow. 



First peduncles from the base of the stems. 



Basal leaves round, 5-7-lobed or -toothed. 15. V. renosa. 



11. 

 12. 



V. nephrophylla. 

 V. seplentrionalis. 

 V. pedatifida. 

 V. Selkirkii. 

 V. renifolia. 



V. palustris. 

 V. Macloskeyi. 



V. sempervirens. 

 V. orbiculata. 



