This section is from the book "Handbook Of Hardy Trees, Shrubs, And Herbaceous Plants", by W. Botting Hemsley. Also available from Amazon: Handbook of hardy trees, shrubs, and herbaceous plants.
Allied to Calochorhis, but all the perianth-segments are bearded within and provided with a honey-pit in the centre. Bulbs tunicated, producing erect leafy stems. Outer divisions of perianth about half as large as the inner. Also natives of North America. The name is a compound of a circle, and a pit, referring to the cavities above mentioned.
1. C. lutea. - This species grows about a foot high with leek-like leaves and two or three terminal yellow flowers. Exterior segments of the perianth greenish, the inner yellow, bordered with purple hairs. The stem is often bulbiferous in the leaf-axilsl
2. C. purpurea. - A more showy plant about 2 feet high. Outer segments of the perianth green and purple outside and yellow within; the inner segments purple outside and yellow within. Both are natives of Mexico, and rather tender.