Flora of North America species comparison

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Bernardia

Bernardia myricifolia

myrtlecroton, oreja de raton

mouse's eye, southwest bernardia
Habit Shrubs [herbs or subshrubs], dioecious [monoecious]; hairs stellate [unbranched or absent]; latex absent. Shrubs to 3 m. Leaves: stipules caducous, green to straw colored, base not thickened, without dark resinous exudate; petiole 0.5–2(–2.2) mm; blade broadly elliptic to orbiculate, 1.5–4.5 × 1–2.5 cm, margins revolute, crenate, laminar glands (0–)2–4(–6), abaxial surface grayish white, densely spreading and/or appressed stellate-pubescent, adaxial surface green, glabrate; veins prominent abaxially.
Leaves

persistent, alternate, simple;

stipules present, persistent or caducous;

petiole present [absent], glands absent;

blade unlobed, margins coarsely crenate to crenate-serrate [serrate or entire], laminar glands usually abaxial, proximal, crateriform, occasionally absent on some leaves [absent];

venation pinnate (with strong secondary veins ascending from base).

Inflorescences

unisexual, axillary, often on short, lateral shoots;

staminate spicate thyrses, pistillate flowers solitary [terminal spikes];

glands subtending bracts 0.

staminate thyrses 5–15 mm.
Pedicels

staminate present, pistillate absent [present].

Staminate flowers

sepals 3(–4), valvate, distinct;

petals 0;

nectary intrastaminal, 1 to several glands;

stamens 3–15(–20)[–50], ± straight in bud, distinct;

pistillode absent.

stamens (10–)12–15(–20), nectary glands claviform.
Pistillate flowers

sepals 3–5, distinct;

petals 0;

nectary absent [present];

pistil 2–3-carpellate;

styles 2–3, distinct, 2-fid, branches flattened, adaxial surface stigmatic.

pistil 3-carpellate;

styles 3, densely penicillate adaxially.
Fruits

capsules.

Capsules

7–8 mm, 3-lobed.
Seeds

subglobose;

caruncle absent.

x

= 13.

Bernardia

Bernardia myricifolia
Phenology Flowering spring–summer; fruiting summer–fall.
Habitat Shrub communities on rocky limestone hills in oak-juniper woodlands, thornscrub.
Elevation 100–1300 m. (300–4300 ft.)
Distribution
from USDA
sw United States; sc United States; Mexico; Central America; South America; West Indies
[BONAP county map]
from FNA
TX; Mexico (Chihuahua, Coahuila, Durango, Nuevo León, San Luis Potosí, Sonora, Tamaulipas)
[WildflowerSearch map]
[BONAP county map]
Discussion

Species ca. 70 (3 in the flora).

The species that occur in the flora area are distinct from most species of the genus in being shrubs with relatively small leaves and stellate vestiture; most Bernardia species are perennial herbs or subshrubs. The rounded shrubs native to the flora area grow well in cultivation and would make attractive native borders within their range.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

In the flora area, Bernardia myricifolia is known from southern Texas, with a single outlying collection from Brewster County [H. B Parks 1724 (MO); B. L. Turner et al. 2003]. Reports of B. myricifolia from Arizona and California are based on plants identified here as B. incana. Reports of B. myricifolia from New Mexico are based on specimens of B. obovata. In Mexico, B. myricifolia is most abundant in thornscrub in the northeast to montane areas of the Chihuahuan Desert.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Leaf blade abaxial surfaces green, sparsely spreading stellate-pubescent, veins not prominent abaxially; pistils 2-carpellate.
B. obovata
1. Leaf blade abaxial surfaces grayish white, densely appressed and/or spreading stellate-pubescent, veins prominent abaxially; pistils 3-carpellate.
→ 2
2. Stipules persistent, yellowish brown to black, bases thickened, with dark resinous exudate; stamens (3–)5–7.
B. incana
2. Stipules caducous, green to straw colored, bases not thickened, without dark resinous exudate; stamens (10–)12–15(–20).
B. myricifolia
Source FNA vol. 12, p. 182. Author: Mark H. Mayfield. FNA vol. 12, p. 183.
Parent taxa Euphorbiaceae Euphorbiaceae > Bernardia
Sibling taxa
B. incana, B. obovata
Subordinate taxa
B. incana, B. myricifolia, B. obovata
Synonyms Tyria myricifolia
Name authority Houstoun ex Miller: Gard. Dict. Abr. ed. 4, vol. 1. (1754) (Scheele) S. Watson: in W. H. Brewer et al., Bot. California 2: 70. (1880) — (as myricaefolia)
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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