This section is from the book "Commercial Gardening Vol2", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
There are several species of hardy Spurge worts, all easily grown in ordinary soil, and increased from seeds or division. The best selling kinds are capitata, 6 in., yellow; Cyparissias, the Cypress Spurge, 1-2 ft., with narrow leaves and dense masses of yellowish-green roundish bracts (commonly called flowers); epithymoides, 1 ft., golden yellow; Lathyris, 3 ft., the Caper Spurge, greenish-yellow; Myrsinites, 9 in. golden-yellow; and Wulfeni, a fine plant with dense heads of greenish-yellow cuplike bracts.