Flora of North America species comparison

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Antirrhinum

snapdragon
Habit Herbs [shrubs], perennial or annual.
Stems

erect, filiform, twining branches absent, glabrous or hairy.
Leaves

cauline, opposite proximally, alternate distally;

petiole absent [present];

blade not fleshy, not leathery, margins entire.
Inflorescences

terminal [axillary], racemes [flowers solitary];

bracts present.
Pedicels

present;

bracteoles absent [present].
Flowers

bisexual;

sepals 5, basally connate, calyx slightly bilaterally symmetric, cupulate, lobes ovate to lanceolate;

corolla mauve, purple, red, yellow, or white, bilaterally symmetric, bilabiate and personate, tubular [funnelform], 25–45 mm, tube base gibbous abaxially, not spurred, lobes 5, abaxial 3, adaxial 2;

stamens 4, basally adnate to corolla, didynamous, filaments glabrous, pollen sacs 2 per filament;

staminode 0 or 1, minute;

ovary 2-locular, placentation axile;

stigma capitate.
Fruits

capsules, 10–15 mm, locules unequal, dehiscence poricidal.
Seeds

20–100, light brown to brown, ovoid, reticulate, wings absent.
x

= 8.

Antirrhinum
Distribution
from USDA
Europe (Mediterranean region) [Introduced in North America; introduced also in temperate regions nearly worldwide]
[BONAP county map]
Discussion

Species 19 (1 in the flora).

Antirrhinum is sometimes treated as a larger genus including both the species of Mediterranean Europe and the species of western North America (D. M. Thompson 1988). Here, the North American species are treated in five genera, Howelliella, Mohavea, Neogaerrhinum, Pseudorontium, and Sairocarpus, believed to be more closely related to one another than to the European species (D. A. Sutton 1988). There is not yet enough evidence to resolve these relationships; DNA sequence data seem to indicate that the European and North American species are sister groups and that there are at least two groups of closely related species among the American taxa (R. K. Oyama and D. A. Baum 2004; M. Fernández-Mazuecos et al. 2013).

Antirrhinum is distinguished from the segregate genera by the radially symmetric seeds, terminal (versus oblique) styles, and flowers more than 2 cm.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 17, p. 16. Authors: Kerry A. Barringer, Neil A. Harriman†.
Parent taxa Plantaginaceae
Subordinate taxa
A. majus
Name authority Linnaeus: Sp. Pl. 2: 612. (1753): Gen. Pl. ed. 5, 268. (1754)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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