Text-book of structural and physiological botany . Fig. 216.—Fleshy coenanthiumof Dorstenia. Fig. 218.—Receptacle of Anthemisarvensis with palese between Fig. 219.—Capitulum of marigold, withimbricate involucre. Fig. 220.—Simple umbel ofthe cherry. 120 Structural and Physiological Botany. the marginal flowers of each capitulum are larger and moreconspicuous than the internal ones, and the capitulum isthen said to be rayed [the outer flowers being termed flowersox florets of the ray, the inner ones flowers or florets of the disc\as in the chamomile (Fig. 214), single aster, marigol
Text-book of structural and physiological botany . Fig. 216.—Fleshy coenanthiumof Dorstenia. Fig. 218.—Receptacle of Anthemisarvensis with palese between Fig. 219.—Capitulum of marigold, withimbricate involucre. Fig. 220.—Simple umbel ofthe cherry. 120 Structural and Physiological Botany. the marginal flowers of each capitulum are larger and moreconspicuous than the internal ones, and the capitulum isthen said to be rayed [the outer flowers being termed flowersox florets of the ray, the inner ones flowers or florets of the disc\as in the chamomile (Fig. 214), single aster, marigold, &c. The umbel resembles the capitulum in the fact of the stemterminating in a number of flowers, but each separate floweris stalked. The umbel is simple when the main stem orpeduncle ends in a number of separate stalked flowers, asin the cherry (Fig. 220), co7npound v^htw it branches into anumber of secondary umbels or umbellules (Fig. 221), [as in the majority of genera ofUmbelliferae]. The mainumbel is generally sur-rounded at its base by awhorl of bracts, againcalled an involucre^ whilethe whorl surroundingeach of the secondaryumbels is an involu
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