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- Kalmia procumbens
Kalmia procumbens — Alpine-azalea
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Facts
Alpine-azalea is a small shrub that foms cushiony mounds no more than 4 inches (10 cm) tall. It inhabits northern, alpine regions around the world but in New England is only known from our higher mountains in Maine and New Hampshire. Tiny pink, crown-shaped flowers are produced in June to August, tucked in between the leathery, opposite leaves. Its tight growth form and tough leaf cuticles protect it from the cold, desiccating winds that blow all summer across mountain summits.
Habitat
Alpine or subalpine zones, ridges or ledges
New England distribution
Adapted from BONAP data
Native: indigenous.
Non-native: introduced (intentionally or unintentionally); has become naturalized.
County documented: documented to exist in the county by evidence (herbarium specimen, photograph). Also covers those considered historical (not seen in 20 years).
State documented: documented to exist in the state, but not documented to a county within the state. Also covers those considered historical (not seen in 20 years).
Note: when native and non-native populations both exist in a county, only native status is shown on the map.
Found this plant? Take a photo and post a sighting.
Characteristics
- Habitat
- terrestrial
- New England state
-
- Maine
- New Hampshire
- Growth form
- the plant is a shrub (i.e., a woody plant with several stems growing from the base)
- Leaf type
- the leaf blade is simple (i.e., lobed or unlobed but not separated into leaflets)
- Leaves per node
- there are two leaves per node along the stem
- Leaf blade edges
- the edge of the leaf blade has no teeth or lobes
- Leaf duration
- the leaves remain green all winter
- armature on plant
- the plant does not have spines, prickles, or thorns
- Leaf blade length
- 3–8 mm
- Leaf blade width
- 2–4 mm
- Leaf stalk
-
- the leaves have leaf stalks
- the leaves have no leaf stalks, but attach directly to the stem
- Fruit type (general)
- the fruit is dry and splits open when ripe
- Bark texture
- the bark of an adult plant is thin and smooth
- Twig winter color
- gray
- Bud scale number
- there are two scales on the winter bud, and their edges meet
-
Buds or leaf scars
- Bud scale number
- there are two scales on the winter bud, and their edges meet
- Bud scar shape (Fraxinus)
- NA
- Collateral buds
- there are no collateral buds on the sides of the branches
- Leaf scar arrangement
- there are two leaf scars per node on the stem or twig
- Superposed buds
- there are no superposed buds on the branch
- Winter bud scales
- the winter bud is perulate (partially or completely covered with one or more scales)
- Winter bud stalks
- the winter buds have no stalks
-
Flowers
- Anther color
- there is a noticeable pink, reddish or purplish tint to the anthers
- Carpels fused
- the carpels are fused to one another
- Enlarged sterile flowers
- there are no enlarged sterile flowers on the plant
- Flower petal color
-
- pink
- white
- Flower symmetry
- there are two or more ways to evenly divide the flower (the flower is radially symmetrical)
- Hairs on ovary (Amelanchier)
- NA
- Hypanthium present
- the flower does not have a hypanthium
- Inflorescence hairs
- there are no hairs on the inflorescence
- Inflorescence type
-
- the inflorescence has only one flower on it
- the inflorescence is a raceme (a long unbranched stem with stalked flowers growing along it)
- the inflorescence is an umbel (with an axis so short it appears the flowers all originate from the same point)
- Number of pistils
- 1
- Ovary position
- the ovary is above the point of petal and/or sepal attachment
- Petal and sepal arrangement
- the flower includes two cycles of petal- or sepal-like structures
- Petal appearance
- the petals are thin and delicate, and pigmented (colored other than green or brown)
- Petal fusion
- the perianth parts are fused to form a tube, cup, or bell shape
- Sepal appearance
- the sepals resemble leaves in color and texture
- Sepal cilia (Ilex)
- NA
- Sepal tip glands
- there are no glands at the tips of the sepal lobes
- Sepals fused only to sepals
- the sepals are fused to each other (not other flower parts), at least near their bases
- Stamen number
- 5
- Stamens fused
- the stamens are not fused to one another
-
Fruits or seeds
- Berry color
- NA
- Fruit tissue origin
- there are no flower parts that form part of the fruit
- Fruit type (general)
- the fruit is dry and splits open when ripe
- Fruit type (specific)
- the fruit is a capsule (splits along two or more seams, apical teeth or pores when dry, to release two or more seeds)
- Nut with spines (Fagaceae)
- NA
- Wings on fruit
- there are no wings on the fruit
-
Glands or sap
- Sap color
- the sap is clear and watery
- Stalked glands on fruit (Rosa)
- NA
-
Growth form
- Growth form
- the plant is a shrub (i.e., a woody plant with several stems growing from the base)
-
Leaves
- Hairs on underside of leaf blade
- the underside of the leaf has hairs on it
- Hairs on upper side of leaf blade
-
- the upper side of the leaf is fuzzy or hairy
- the upper side of the leaf is not hairy, or has very few hairs
- Leaf blade base shape
- the base of the leaf blade is cuneate (wedge-shaped, tapers to the base with relatively straight, converging edges), or narrow
- Leaf blade base symmetry
- the leaf blade base is symmetrical
- Leaf blade bloom
- there is a noticeable powdery or waxy bloom on the underside of the leaf
- Leaf blade edges
- the edge of the leaf blade has no teeth or lobes
- Leaf blade edges (Acer)
- NA
- Leaf blade flatness
- the edges of the leaf are curled under
- Leaf blade hairs
-
- at least some of the hairs on the leaf blade have glands at their tips
- the hairs on the leaf blade are different from the choices given
- the leaf blade has tangled or woolly-looking hairs, without glands
- Leaf blade length
- 3–8 mm
- Leaf blade scales
- there are no scales on the leaf blades
- Leaf blade shape
-
- the leaf blade is lanceolate (lance-shaped; widest below the middle and tapering at both ends)
- the leaf blade is ovate (widest below the middle and broadly tapering at both ends)
- Leaf blade texture
- the leaf blade is coriaceous (has a firm, leathery texture)
- Leaf blade translucent dots
- there are no translucent dots on the leaf blade
- Leaf blade vein pattern
- the main veins of the leaf blade are pinnate (the secondary veins branch off at intervals from the main central vein) and non-arcuate (not arched towards the leaf tip)
- Leaf blade veins
- the leaf blade has one main vein running from the base toward the tip
- Leaf blade width
- 2–4 mm
- Leaf duration
- the leaves remain green all winter
- Leaf form
- the plant is broad-leaved (with broadly flattened leaf blades)
- Leaf lobe tips (Quercus)
- NA
- Leaf midrib glands
- the midrib of the leaf blade has glands on the upper surface
- Leaf stalk
-
- the leaves have leaf stalks
- the leaves have no leaf stalks, but attach directly to the stem
- Leaf stalk attachment to leaf
-
- NA
- the petiole attaches at the basal margin of the leaf blade
- Leaf stalk nectaries
- there are no nectaries on the leaf stalk
- Leaf stalk shape
- the leaf stalk is not flattened
- Leaf teeth
- the edge of the leaf blade is entire (has no teeth or lobes)
- Leaf teeth hairs (Carya)
- NA
- Leaf type
- the leaf blade is simple (i.e., lobed or unlobed but not separated into leaflets)
- Leaves per node
- there are two leaves per node along the stem
- Specific leaf type
- the leaves are simple (i.e., lobed or unlobed but not separated into leaflets
- Stipules
- there are no stipules on the plant, or they fall off as the leaf expands
-
Place
- Habitat
- terrestrial
- New England state
-
- Maine
- New Hampshire
- Specific habitat
-
- alpine or subalpine zones
- ridges or ledges
-
Scent
- Plant odor
- the plant does not have much of an odor, or it has an unpleasant or repellant odor
-
Stem, shoot, branch
- Aerial roots
- the plant has no aerial roots
- Bark texture
- the bark of an adult plant is thin and smooth
- Branch brittleness (willows only)
- NA
- Branch cross-section
- the branch is circular in cross-section, or it has five or more sides, so that there are no sharp angles
- First-year cane (Rubus)
- NA
- Lenticels on twigs
- there are no lenticels on the twigs, or they are very hard to see
- Short shoots
- there are no peg- or knob-like shoots present
- Twig bloom
- there is no bloom on the twig
- Twig hairs
-
- the twigs have few or no hairs on them
- the twigs have hairs, but the hairs do not have glands
- Twig papillae (Vaccinium species only)
- NA
- Twig scales
- there are no scales on the twig surface
- Twig winter color
- gray
- Wings on branch
- the branch does not have wings on it
- armature on plant
- the plant does not have spines, prickles, or thorns
Wetland status
Not classified
In New England
Distribution
- Connecticut
- absent
- Maine
- present
- Massachusetts
- absent
- New Hampshire
- present
- Rhode Island
- absent
- Vermont
- absent
Conservation status
Exact status definitions can vary from state to state. For details, please check with your state.
- Maine
- extremely rare (S-rank: S1), threatened (code: T)
- New Hampshire
- rare (S-rank: S2), threatened (code: T)
From Flora Novae Angliae dichotomous key
4. Kalmia procumbens (L.) Gift, Kron, & P.F. Stevens ex Galasso, Banfi, & F. Conti NC
alpine-azalea. Azalea procumbens L.; Chamaecistus procumbens (L.) Kuntze; Loiseleuria procumbens (L.) Desv. • ME, NH. Alpine ridges, plateaus, and gullies. This species was first combined under Kalmia without reference to the basionym in 2002 (as Kalmia procumbens (L.) Gift, Kron, & P.F. Stevens). It was later corrected by Gift and Kron in 2008 (as K. procumbens (L.) Gift & Kron), but only after this error was already remedied by Galasso et al. in 2005 (as K. procumbens (L.) Gift, Kron, & P.F. Stevens ex Galasso, Banfi, & F. Conti). Therefore, astute students may notice three different naming authorities ascribed to K. procumbens in various works.