Flora of North America species comparison

The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

Alcea

hollyhock
Habit Herbs, [annual], biennial or perennial, stellate-hairy to pilose or hirsute or glabrous, [sometimes with some long, simple hairs, sometimes glabrate].
Stems

erect, usually simple.
Leaves

stipules persistent or caducous, ovate [unlobed] or 2–4-fid, sparsely to densely stellate-pilose;

blade orbiculate, angled, weakly lobed or deeply palmately parted, base cordate, cuneate, or truncate, margins crenate-serrate, apex acute to obtuse.
Inflorescences

terminal and/or axillary, usually unbranched, racemes, often with 1–5-flowered axillary fascicles, elongate, flowers axillary, solitary or fascicled;

involucellar bractlets persistent, attached to apex of pedicel, connate basally, 6–7[–9]-parted, stellate-hairy.
Flowers

calyx usually accrescent, not inflated, lobes slightly or conspicuously striate, lanceolate, margins entire, apex obtuse to acuminate, densely stellate-pilose-hairy;

corolla rotate, white, pink, red, purple, or yellow, darker or paler basally, base densely white-pilose-hairy;

staminal column exserted, 5-angled, anthers crowded, pale yellow, glabrous;

ovary [15–]20–40-carpellate;

ovules 1 per carpel;

style [15–]20–40-branched (equaling number of locules);

stigmas decurrent, filiform.
Fruits

schizocarps, erect, not inflated, disc-shaped, dry, central axis equaling or shorter than mericarps, indehiscent;

mericarps [15–]20–40, 2-celled (proximal cell 1-seeded, distal cell sterile), laterally compressed and reniform-circular with prominent ventral notch, smooth to wrinkled, hairy [glabrous].
Seeds

1 per mericarp, brown, reniform, glabrous or minutely hairy.
x

= 21 [n = 13, 21].

Alcea
Distribution
from USDA
s Europe; Asia (Mediterranean region to c Asia) [Introduced in North America]
[BONAP county map]
Discussion

A few species of Alcea are widely cultivated and both species in the flora area are escapes from cultivation. Various authors have treated some of these taxa within Althaea, but this disagrees with Linnaeus’s concepts of the two genera as quite distinct. The primary difference is that Alcea has a two-chambered mericarp (the upper chamber being empty and vestigial) and yellowish anthers, and Althaea has a one-chambered mericarp and purple or brownish-purple anthers. Current treatments consistently accept the two genera as distinct; see M. E. Uzunhisarcikii and M. Vural (2012) for a discussion of the two genera and their circumscriptions.

Alcea biennis Winterl occasionally is planted and rarely is found as an escape. It differs from the two species treated here by its white to pink corolla with a pale yellow to greenish center and by its generally more deeply lobed petals that are usually more separated and less overlapping. Its involucel is more than one-half as long as the calyx, sometimes equal in length, the sepals are conspicuously striate, the pedicel is 1–25 mm long, and the mericarps are conspicuously winged; its leaves are inconspicuously lobed or merely angled.

Species ca. 70 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Leaf blades angled or shallowly lobed or rarely more deeply; flowers usually white, pink, red, or purple, rarely yellow, not drying greenish; involucellar bractlets 1/2+ calyx length.
A. rosea
1. Leaf blades lobed usually halfway or more to midrib, often figlike; flowers pale yellow, usually drying greenish; involucellar bractlets usually 1/2–2/3 calyx length.
A. rugosa
Source FNA vol. 6, p. 227. Author: Steven R. Hill.
Parent taxa Malvaceae > subfam. Malvoideae
Subordinate taxa
A. rosea, A. rugosa
Name authority Linnaeus: Sp. Pl. 2: 687. (1753): Gen. Pl. ed. 5, 307. (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).



Type/paste one or more Latin names into the boxes above; matching taxa will show up below the box as you type. You can use the up/down arrow keys to move through the list.

(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Apiaceae, Boraginaceae, and Polemoniaceae.)

Choose a data source: Flora of North America, OregonFlora, UW Burke Herbarium

The species comparison tool is brought to you by:
Northwest Wildflowers