COMPOSITAE. 241 



361. HETEROCODON. 



A very delicate little annual; flowers of two sorts, the lower 

 and earlier ones with merely rudimentary corollas and self- 

 fertilized in the bud ; calyx with an obovate or inversely pyramidal 

 tube much shorter than the foliaceous lobes, these broadly ovate, 

 sharply toothed, veiny, 3 or 4 in the earlier; 5 in the later flowers; 

 corolla short-campanula te, 5-lobed; stamens and style as in 

 Campanula; capsule 3-celled, 3-angled, bursting on the side; 

 seeds numerous. 



Heterocodon rariflorum Nutt. Annual, the slender stems simple or 

 branched below, 8-20 cm. high, sparsely hairy; leaves ovate or orbicular, 

 sessile and partly clasping, coarsely dentate, somewhat scabrous-ciliate, 3-10 

 mm. long; earlier flowers without corolla, the later ones with blue corollas, 

 barely exceeding the calyx; calyx 5-8 mm. long, more or less hispid, the ovate 

 acuminate usually toothed lobes a little longer than the tube. Rare in moist 

 places. 



362. CAMPANULA. Bellflower. 



Chiefly perennial herbs; flowers all alike, showy; calyx-lobes 

 narrow; corolla campanulate or nearly so, 5-lobed or cleft; 

 stamens 5; filaments dilated at base; capsule short, 3-5-celled, 

 opening on the side or near the base by 3-5 small uplifted valves 

 leaving round perforations, many-seeded. 



Campanula rotundifolia L. Perennial, glabrous, erect, branched at the 

 very base, 10-40 cm. high; basal and lower leaves broadly ovate or orbicular, 

 cordate, dentate or entire, petioled ; cauline linear, the lower somewhat spatu- 

 late, acute, sessile, 2-7 cm. long; flowers solitary or racemose, erect; pedicels 

 slender, nodding in the fruit; calyx-lobes subulate, longer than the tube, one- 

 half or one-third as long as the corolla; corolla campanulate, blue, 12-20 mm. 

 long; capsule openings near the base. Dry woods, Thatuna Hills. 



Family 90. COMPOSITAE. 



Annual, biennial or perennial herbs or undershrubs (in ours); 

 leaves without stipules; flowers in a close head on a common 

 receptacle, surrounded by one or more rows of bracts (the 

 involucre) ; heads 1-many, discoid when all the flowers bear 

 tubular corollas. Ululate when the corollas are all strap-shaped, 

 radiate when the outer corollas are strap-shaped and the inner 

 tubular, in which case the outer are ray-flowers and the inner disk- 

 flowers; receptacle often covered with bracts or scales (chaff), 

 each subtending a flower; calyx gamosepalous, its tube wholly 

 adherent to the ovary, its limb (pappus) none or cup-shaped or 

 developed into teeth, scales, awns or capillary bristles; corollas 

 alike in all the flowers of the head or dissimilar, either tubular or 



17 



