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Kalmia polifolia

Common name:	Swamp Laurel	Family:	Ericaceae
Author:	Wangenh.	Botanical references:	11, 200
Synonyms:	Kalmia glauca (Aiton.)
Known Hazards:	The foliage is poisonous to animals[21, 65, 76]. The whole plant is highly toxic[222].
Range:	Northern N. America - Newfoundland to Hudson Bay, southwards. Nat. in Britain in a bog in Surrey.
Habitat:	Cold peat bogs and other wet places[11, 200].
Edibility Rating (1-5):	0	Medicinal Rating (1-5):	2

Other Possible Synonyms:	From various places across the web, may not be correct. See below.
	Chamaedaphne glauca[B,P] K. glauca var. microphylla[G] K. microphylla[B,C,CAL,G,Shl,Smap,Sn3,Sn6,Swal,P] K. microphylla ssp. occidentalis[B,P] K. microphylla var. occidentalis[B,P] K. occidentalis[B,P] K. polifolia ssp. microphylla[B,P] K. polifolia ssp. occidentalis[B,P] K. polifolia var. microphylla[B,G,P] K. polifolia var. rosmarinifolia[B,P]
Other Common Names:	From various places around the Web, may not be correct. See below.
	Alpine Laurel [P], Alpine-laurel [B], Bog Laurel [P], Bog-laurel [B], Mountain Laurel, Western [S], Swamp Laurel [H], Western Mountain Laurel [S], Western Mountain Laurel, Lambkill [S],
Systematics:	From a USDA Plants Database
	Order: Ericales. Heath family
Other Range Info:	From the Ethnobotany Database
	Canada(Kwakiutl)

Physical Characteristics

An evergreen shrub growing to 0.5m by 0.5m . It is hardy to zone 2. It is in leaf all year, in flower in April, and the seeds ripen in September. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Bees. We rate it 0/5 for edibility and 2/5 for medicinal use.

The plant prefers light (sandy), medium (loamy) and heavy (clay) soils and requires well-drained soil. The plant prefers acid soils and can grow in very acid soil. It can grow in semi-shade (light woodland) or no shade. It requires moist soil.

Habitats and Possible Locations

Bog Garden, Woodland, Dappled Shade, Shady Edge.

Edible Uses

None known

Medicinal Uses

Disclaimer

Astringent Narcotic Poultice Salve Sedative.

Swamp laurel is a very poisonous narcotic plant the leaves of which were at one time used by some native North American Indian tribes in order to commit suicide[4]. It is little, it at all, used in modern herbalism though the leaves are a good external treatment for many skin diseases and inflammation[4].
The leaves are astringent and sedative[4, 21, 61]. They are used externally to make a poultice or a wash in the treatment of many skin diseases, open sores, wounds that will not heal and inflammation[4, 257].
Used internally, the leaves have a splendid effect in the treatment of active haemorrhages, diarrhoea and flux[4, 21, 61]. They should be used with great caution however, and only under the supervision of a qualified practitioner. See the notes above on toxicity.

Other Uses

None known

Cultivation details

Requires an acid humus-rich soil, succeeding in part shade[182] or in full sun in cooler areas. Prefers almost full sun[11]. Dislikes dry soils[182], requiring cool, permanently moist conditions at the roots[21]. Succeeds in open woodland or along the woodland edge[200].
A very cold-hardy plant, tolerating temperatures down to about -30° c[184].
A very ornamental plant[11], there are some named varieties[200].
Pruning is not normally necessary[200].

Propagation

Seed - surface sow in late winter in a cool greenhouse in light shade[78, 113]. Prick out the young seedlings into individual pots as soon as they are large enough to handle. The seedlings are rather sensitive to damping off, so water them with care, keep them well-ventilated and perhaps apply a fungicide such as garlic as a preventative. Grow the young plants on in light shade and overwinter them in the greenhouse for their first winter[78]. Plant them out into their permanent positions in early summer. The seed is dust-like and remains viable for many years[113].
Cuttings of half-ripe wood, August in a frame. Very poor results unless the cuttings are taken from very young plants[11, 78].
Layering in August/September. Takes 18 months[78]. The plants can also be dug up and replanted about 30cm deeper in the soil to cover up some of the branches. The plant can then be dug up about 12 months later when the branches will have formed roots and can be separated to make new plants[200].

Cultivars

'': There are some named forms for this species, but these have been developed for their ornamental value and not for their other uses. Unless you particularly require the special characteristics of any of these cultivars, we would generally recommend that you grow the natural species for its useful properties. We have, therefore, not listed the cultivars in this database[K].

Suppliers

For more details of plant suppliers please see our Suppliers Page which lists many more places to look.

Web References

Details of Medicinal Uses, Habitats, etc. in M. Grieve A Modern Herbal (1931) [4]
[E] Ethnobotany Data (common names, uses, countries) from the Ethnobotany Database.
[B] Data (Latin & Common names, other references) from the BONAP's Synonymized Checklist of the Vascular Flora of the United States, Puerto Rico, and the Virgin Islands.
[S] Illustration from the Southwest School of Botanical Medicine
[G] Data (Common Names, Uses, Distribution) from the USDA/ARS NPGS's GRIN taxonomic database.
[C] Taxon data. from the CalFlora database.
Images from the CalPhoto database.
[C] Taxon data. from the CalFlora database.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.
[HP] Links, Photos, Suppliers from Hortiplex Plant Database

References for Kalmia glauca (a possible synonym).

[H] Details of Scandanavian and European Common names in Henriette's names database

References for Kalmia microphylla (a possible synonym).

[V] Images from the Vascular Plant Image Gallery of the Texas A& M Bioinformatics Working Group.
[B] Data (Latin & Common names, other references) from the BONAP's Synonymized Checklist of the Vascular Flora of the United States, Puerto Rico, and the Virgin Islands.
[S] Image from the Southwest School of Botanical Medicine
[S] Image from the Southwest School of Botanical Medicine
[S] Image from the Southwest School of Botanical Medicine
[S] Illustration from the Southwest School of Botanical Medicine
[S] SW USA Dist. Maps from the Southwest School of Botanical Medicine
[S] Image from the Southwest School of Botanical Medicine
[G] Data (Common Names, Uses, Distribution) from the USDA/ARS NPGS's GRIN taxonomic database.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.

References for the family Ericaceae.

[CHINA] Draft Data for parts of family Very detailed botanical/identification info. from the Flora of China.

See the PFAF Links Pages for other sources.

Also try Photos and info from the The Plants Database which has 14,000 images.

References

[4] Grieve. A Modern Herbal. Penguin 1984 ISBN 0-14-046-440-9
Not so modern (1930's?) but lots of information, mainly temperate plants.

[11] Bean. W. Trees and Shrubs Hardy in Great Britain. Vol 1 - 4 and Supplement. Murray 1981
A classic with a wealth of information on the plants, but poor on pictures.

[21] Lust. J. The Herb Book. Bantam books 1983 ISBN 0-553-23827-2
Lots of information tightly crammed into a fairly small book.

[61] Usher. G. A Dictionary of Plants Used by Man. Constable 1974 ISBN 0094579202
Forget the sexist title, this is one of the best books on the subject. Lists a very extensive range of useful plants from around the world with very brief details of the uses. Not for the casual reader.

[65] Frohne. D. and Pfänder. J. A Colour Atlas of Poisonous Plants. Wolfe 1984 ISBN 0723408394
Brilliant. Goes into technical details but in a very readable way. The best work on the subject that I've come across so far.

[76] Cooper. M. and Johnson. A. Poisonous Plants in Britain and their Effects on Animals and Man. HMSO 1984 ISBN 0112425291
Concentrates mainly on the effects of poisonous plants to livestock.

[78] Sheat. W. G. Propagation of Trees, Shrubs and Conifers. MacMillan and Co 1948
A bit dated but a good book on propagation techniques with specific details for a wide range of plants.

[113] Dirr. M. A. and Heuser. M. W. The Reference Manual of Woody Plant Propagation. Athens Ga. Varsity Press 1987 ISBN 0942375009
A very detailed book on propagating trees. Not for the casual reader.

[182] Thomas. G. S. Ornamental Shrubs, Climbers and Bamboos. Murray 1992 ISBN 0-7195-5043-2
Contains a wide range of plants with a brief description, mainly of their ornamental value but also usually of cultivation details and varieties.

[184] Phillips. R. & Rix. M. Shrubs. Pan Books 1989 ISBN 0-330-30258-2
Excellent photographs and a terse description of 1900 species and cultivars.

[200] Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992 ISBN 0-333-47494-5
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.

[222] Foster. S. & Duke. J. A. A Field Guide to Medicinal Plants. Eastern and Central N. America. Houghton Mifflin Co. 1990 ISBN 0395467225
A concise book dealing with almost 500 species. A line drawing of each plant is included plus colour photographs of about 100 species. Very good as a field guide, it only gives brief details about the plants medicinal properties.

[257] Moerman. D. Native American Ethnobotany Timber Press. Oregon. 1998 ISBN 0-88192-453-9
Very comprehensive but terse guide to the native uses of plants. Excellent bibliography, fully referenced to each plant, giving a pathway to further information. Not for the casual reader.

Readers Comments

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Plant information taken from the Plants For A Future - Species Database. Copyright (c) 1997-2003.
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