Order 18.— ST. JOHNSWORTS. 



171 



3 L. major. Larger P. Hairy ; leaves elliptical ; pods angular. l-2f. 



4 L. thj^mifo'lia. Iloarj^-puberulcnt ; leaves narrowly oblanceolate ; pods quite rounded, 



larger (near 1"), polished. 10-20' high. 



3. HELIAN'THEMUM. Rock Rose. 



Petals 5 (wlicn present), crumpled in biul, fugacious. Stamens few or 

 many. Stigma 3-lobed. Capsule triangular, 3-valved, opening at the top. 



* Flowers of two sorts, the later ones apetalous. Stamens 3-10 Nos. 1, 2. 



* Flowers all alike, 5-petalled. Stamens CO Nos. 3, 4. 



1 H. Oanaden'se. Flowers solitary, tei*minal, the apetalous flowers in axillary clusters ; 



sepals acute ; leaves lanceolate, acute, with rolled edges. In dry soil. Can. to Va. 

 Stems 8-12' high. Plant hoary-pubescent. Juhj-Angvst. 



2 H. corymbo'sum. Flowers all terminal, crowded ; sepals obtuse, woolly. N. J. and S. 



3 H. Carolinia'num. Flowers subterminal, large ; sepals acuminate. South. 



i H. arenic'ola. White-tomentous; leaves and sepals obtuse. 3-G'. In sand. S. 



Order XYIII. HYPERICACE.E. St. Johnsworts. 



Herhs or shruhs with opposite, entire 

 dotted leaves, and no stipules ; 



flowers mostly yellow, in cymes ; 



sepals unequal, 4-5, dotted; 



petals 4-5, twisted in the bud, dotted, 

 and with the veins oblique ; 



stamens hypogynous, in 3 or more par- 

 cels; 



ovary superior; style 1 ; 



fruit a capsule or berry, many-seeded. 



Analysis of tlie Genera. 



Petals and sepals 5 2 



Petals and sepals 4. Flowers yellow. 



St. Peterswort. As'cyrum. 

 2 Fls. yellow. St. Johnswort. Hyper'icum. 1 

 2 Flowers purplish. Elode'a. 



Flq. 400. Hypericum perforatum (Common St. 

 Johnswort): stem, leaves, and flowers. Fig. 401. 

 The stamens in 3 sets siirronndiiig the ovary witli 3 

 Gtyles. Fig. 402. Cross-section of the ovary 



400 



