_Tubular_; when prolonged into a tube, with little or no spreading at the border, as in the corolla of the Trumpet Honeysuckle, the calyx of Stramonium (Fig. 246), etc. 261. Although sepals and petals are usually all blade or lamina (123), like a sessile leaf, yet they may have a contracted and stalk-like base, answering to petiole. This is called its CLAW, in Latin _Unguis_. _Unguiculate_ petals are universal and strongly marked in the Pink tribe, as in Soapwort (Fig. 248). [Illustration: Fig. 259. Unguiculate (clawed) petal of a Silene; with a two-parted crown.] [Illustration: Fig. 260. A small Passion-flower, with crown of slender threads.] 262. Such petals, and various others, may have an outgrowth of the inner face into an appendage or fringe, as in Soapwort, and in Silene (Fig. 259), where it is at the junction of claw and blade. This is called a CROWN, or _Corona_. In Passion-flowers (Fig. 260) the crown consists of numerous threads on the base of each petal. [Illustration: Fig. 261. Front view of a papilionaceous corolla. 262. The parts of the same, displayed: _s_, Standard, or Vexillum; _w_, Wings, or Alæ; _k_, Keel, or Carina.] 263. =Irregular Flowers= may be polypetalous, or nearly so, as in the papilionaceous corolla; but most of them are irregular through coalescence, which often much disguises the numerical symmetry also. As affecting the corolla the following forms have received particular names: 264. =Papilionaceous Corolla=, Fig. 261, 262. This is polypetalous, except that two of the petals cohere, usually but slightly. It belongs only to the Leguminous or Pulse family. The name means butterfly-like; but the likeness is hardly obvious. The names of the five petals of the _papilionaceous_ corolla are curiously incongruous. They are, The STANDARD or _Banner_ (_Vexillum_), the large upper petal which is external in the bud and wrapped around the others. The WINGS (_Alæ_), the pair of side petals, of quite different shape from the standard. The KEEL (_Carina_), the two lower and usually smallest petals; these are lightly coalescent into a body which bears some likeness, not to the keel, but to the prow of a boat; and this encloses the stamens and pistil. A Pea-blossom is a typical example; the present illustration is from a species of Locust, Robinia hispida.