heart-leaved skullcap

(Scutellaria ovata ssp. ovata)

               
Conservation Status

IUCN Red List

not yet assessed

 

No image available

NatureServe

N5 - Secure

S2 - Imperiled

Minnesota

Threatened

Wetland
Indicator
Status

Great Plains

FACU - Facultative upland

Midwest

FACU - Facultative upland

Northcentral & Northeast

FACU - Facultative upland

Nativity

Native

Occurrence

Rare

Habitat

Dry to moderately moist. Upland and bottomland hardwood forests, woodland openings, bluffs. Loamy soil with limestone sand or rock. Full or partial shade.

Flowering

Late June to mid-August

 
Flower Color

Pale blue to bluish-purple and white

 
Height

16 to 27½

 

Identification

This is an erect, perennial forb that rises on a single stem or a small cluster of stems from a slender underground stem (rhizome) and a fibrous root system. It may be 12 to 31½tall, but is usually between 16 and 27½ in height. It readily spreads by producing aboveground runners (stolons), and often forms small colonies of up to 50 plants.

The stems are usually erect, sometimes ascending, four-angled (square), leafy, and usually unbranched below the inflorescence. They are densely covered with soft, spreading, gland-tipped hairs. The foliage is not aromatic.

The leaves are opposite. The largest leaves are 2 to 4½ long and ¾ to 3 wide. They are on hairy, 5 16 to 2 long leaf stalks (petioles). The petioles are not winged at the tip. They become progressively smaller and shorter stalked as they ascend the stem. The leaf blades are heart-shaped to narrowly egg-shaped or triangular egg-shaped; heart-shaped, rounded, or squared off at the base; and usually sharply pointed, sometimes bluntly pointed, at the tip. They are pinnately veined. The veins are only slightly indented on the upper surface—they do not appear puckered. The upper and lower surfaces are densely covered with relatively long, spreading to curved, mostly gland-tipped hairs. The lower surface often also has unstalked glands. The margins are coarsely toothed with usually more than 12 teeth per side.

The inflorescence is 1 to 3 slender, up to 4 long arrangements (racemes) of flowers at the end of the stem. There are sometimes shorter racemes in the upper leaf axils. There are two opposite flowers at each node of the raceme.

Each flower is on a short, slender stalk and is subtended by a single to long modified leaf (bract). The bracts are egg-shaped or broadly egg-shaped and to long, becoming shorter as flowers approach the tip. They do not extend beyond the whorl of sepals (calyx) of the flower which they subtend, except rarely late in the season. The bract on even the lowest flower is much smaller than the uppermost leaves.

The flowers are to 1 long. There are 5 sepals, 5 petals, 4 stamens, and 1 style. The sepals are whitish-green and to 3 16 long in flower. They are united into a calyx tube at the base and separated into 2 shallow, broadly rounded lobes at the tip. They do not have a spine at the tip. They are densely covered with spreading, mostly gland-tipped hairs. The petals are mostly pale blue to bluish-purple. The outer surface of the corolla is densely covered with short, spreading, gland-tipped hairs. The petals are united at the base into a long, narrowly funnel-shaped tube and separated at the tip into 2 lips. The tube is usually white and is “S” shaped, bent upward just above the calyx, straight for most of its length, and curved at or above the throat. The is no ring of hairs in the throat. The upper lip is unlobed, and and rounded. It forms a “skull”-shaped hood. The lower lip is white with blue spots or mottling, often has a narrow blue band at the margin, and is shallowly 3-lobed. It is spreading or arched, slightly longer than the upper lip, and deeply notched at the tip. The lateral lobes of the lower lip are short and ascending, not well developed. The lower lobe is broadly fan-shaped to semicircular and sometimes slightly notched. The stamens have small, pale yellow to white anthers and do not project beyond the corolla tube. The style is branched at the tip and does not project beyond the corolla tube.

The fruit is a dry seed capsule (schizocarp) with 1 to 4 nutlets. The calyx becomes closed and to ¼ long in fruit.

 
Similar
Species

Blue skullcap (Scutellaria lateriflora var. lateriflora) inflorescence is axillary racemes in upper leaf axils—there is no raceme at the end of the stem. The flowers are much smaller.

Leonard’s skullcap (Scutellaria parvula var. missouriensis) is much smaller, no more than 12 tall, usually 8 or less. Leaf margins are untoothed and often curled under. It sometimes produces short, white, self-pollinating flowers.

Marsh skullcap (Scutellaria galericulata) leaf margins have shallow, usually rounded teeth. The inflorescence is single flowers rising from the upper leaf axils.


Distribution Distribution Map  

Sources: 2, 3, 4, 5, 6, 28, 29, 30, 72.

Since 1984, only seven populations have been found in Minnesota.


Comments

 


Taxonomy

Family:

Lamiaceae (mint)

 

Subfamily:

Scutellarioideae

 
Synonyms

Scutellaria cordifolia

Scutellaria ovata ssp. calcarea

Scutellaria ovata ssp. mississippiensis

Scutellaria ovata ssp. pseudovenosa

Scutellaria ovata ssp. versicolor

Scutellaria ovata var. calcarea

Scutellaria ovata var. versicolor

 
Common
Names

egg-leaf skullcap

egg-leaved skullcap

forest skullcap

heart-leaved skullcap

heartleaf skullcap

ovate-leaved skullcap

   

 

 

 

 

 

 

 

Glossary

axil

The upper angle where a branch, stem, leaf stalk, or vein diverges.

 

bract

Modified leaf at the base of a flower stalk or flower cluster.

 

calyx

The group of outer floral leaves (sepals) below the petals, occasionally forming a tube.

 

corolla

A collective name for all of the petals of a flower.

 

glandular hairs

Hairs spread over aerial vegetation that secrete essential oils. The oils act to protect against herbivores and pathogens or, when on a flower part, attract pollinators. The hairs have a sticky or oily feel.

 

node

The small swelling of the stem from which one or more leaves, branches, or buds originate.

 

petiole

The stalk of a leaf blade or compound leaf that attaches the leaf blade to the stem.

 

pinnately veined

With the veins arranged like the vanes of a feather; a single prominent midvein extending from the base to the tip and lateral veins originating from several points on each side.

 

raceme

An unbranched, elongated inflorescence with stalked flowers. The flowers mature from the bottom up.

 

rhizome

A horizontal, usually underground stem. It serves as a reproductive structure, producing roots below and shoots above at the nodes.

 

schizocarp

A dry fruit formed from a compound ovary that splits into two or more parts (mericarps) at maturity.

 

sepal

An outer floral leaf, usually green but sometimes colored, at the base of a flower.

 

stolon

An above-ground, creeping stem that grows along the ground and produces roots and sometimes new plants at its nodes. A runner.

 

wing

A thin, flat, membranous, usually transparent appendage on the margin of a structure.

       

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