The tufted head or umbel is likened by Pliny to a thyrsus.
High, with ovate-lanceolate stalked leaves tapering at the apex, surrounding a naked stalk bearing a flat-topped umbel of small white flowers.
High, ending in an umbel of bright blue, funnel-shaped flowers.
At the base of the general umbel in umbelliferous plants a whorl of bracts often exists, called a general involucre, and at the base of the smaller umbels or umbellules there is a similar leafy whorl called an involucel or partial involucre.
When the axis is so shortened that the secondary axes arise from a common point, and spread out as radii of nearly equal length, each ending in a single flower or dividing again in a similar radiating manner, an umbel is produced, as in fig.
- Compound umbel of Common Dill (Anethum graveolens), having a primary umbel a, and secondary umbels b, without either involucre or involucel.
In Eryngium the shortening of the pedicels changes an umbel into a capitulum.
In Saxifraga umbrosa (London-pride) and in the horse-chestnut we meet with a raceme of scorpioid cymes; in sea-pink, a capitulum of contracted scorpioid cymes (often called a glomerulus); in laurustinus, a compound umbel of dichasial cymes; a scorpioid cyme of capitula in Vernonia scorpioides.
Contracted or shortened form (Umbel), Cowslip, Astrantia.
Compound Umbel, Hemlock and most Umbelliferae.
Biparous Cyme (Dichotomous),including 3-5chotomou3 Cymes (Dichasium, Cymose Umbel, Anthela).
Compound Umbel of Dichotomous Cymes,Laurustinus.
The plants are bulbous herbs, with flat or rounded radical leaves, and a central naked or leafy stem, bearing a head or umbel of small flowers, with a spreading or bell-shaped white, pink, red, yellow or blue perianth.