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Silphium Laciniatum L. Compass Plant

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Silphium Laciniatum L. Compass Plant Silphium laciniatum L. compasscompass plant, plant Page 1 State Distribution Photo by Bradford S. Slaughter Best Survey Period Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec Status: State threatened Michigan, and Ohio. Compass plant is considered introduced in New York and Washington, D.C. Global and state rank: G5/S1S2 State distribution: Compass plant is known from 13 Family: Asteraceae (aster family); also known as the occurrences in Michigan. Eleven of these occurrences Compositae are from southern Lower Michigan, where the species has been documented from Berrien, Cass, Kalamazoo, Synonym: Silphium laciniatum var. robinsonii L.M. Jackson, Washtenaw, Wayne, and St. Clair counties. Perry Some of these populations (e.g., Jackson, Washtenaw, Wayne, and St. Clair counties) are likely adventive Taxonomy: The Asteraceae or Compositae is a very along railroads (Voss 1996). Compass plant has also large family of flowering plants, with perhaps greater been documented from two occurrences in the Upper than 20,000 species (Voss 1996). The North American Peninsula, one site each in Menominee and Delta genus Silphium contains several species of large, counties. perennial herbs characterized by showy heads with sterile disk flowers and conspicuous yellow or white Recognition: Compass plant is a large, erect, taprooted fertile, pistillate rays, undivided styles, imbricate ovaries perennial forb ranging to 3 m in height, characterized in 2-3 series, and wing-margined, strongly flattened by a hirsute, hispid, or scabrous stem, large, coarse, achenes or cypselae. Many species in the genus bear deeply lobed basal leaves, alternate, petiolate or large, coarse leaves. sessile pinnatifid or bipinnatifid cauline leaves (reduced to small, entire leaves on the upper portion Range: Compass plant is widespread in the central of the stem), and numerous large heads in a narrow, United States and Canada, where the species occurs sometimes racemiform inflorescence. The 2-3 cm from Colorado and New Mexico east and north wide disk is exceeded by the involucre, which contains to Ontario, Pennsylvania, and Ohio, and south to ovate, acuminate, squarrose phyllaries with hispid Alabama (NatureServe 2009). The species is considered to scabrous, more-or-less stipitate-glandular abaxial vulnerable in South Dakota, imperiled in Kentucky faces. Ray corollas are large (2-5 cm), conspicuous, and Tennessee, and critically imperiled in Ontario, and yellow. The fruit is a large (to 1.8 cm long and 1.2 Michigan Natural Features Inventory P.O. Box 30444 - Lansing, MI 48909-7944 Phone: 517-373-1552 compass plant, Page 2 cm wide), flattened achene or cypsela containing small puccoon), Parthenium integrifolium (wild quinine), obovate seeds. Three other Silphium species occur in yellow coneflower, Silphium integrifolium (rosinweed), Michigan; S. perfoliatum (cup plant) has square stems prairie dock, stiff goldenrod, Indian grass, Sporobolus and connate leaf bases; S. integrifolium (rosinweed) has heterolepis (prairie dropseed), and Stipa spartea opposite, entire cauline leaves, and S. terebinthinaceum (porcupine grass) (Swink and Wilhelm 1994). (prairie-dock) has unlobed basal leaves. All four Silphium species are concentrated in southern Lower Biology: Compass plant is well-known for the north- Michigan. south vertical orientation exhibited by its lower leaves, primarily the basal leaves of non-flowering plants. Basal Best survey time/phenology: In Michigan, compass leaves and lower cauline leaves exposed to directional plant flowers in July through September, and fruits in sunlight orient over a 2-3 week period of expansion. August and September. Although compass plant is most Development of compass orientation may result from conspicuous during its flowering period, the species the stimulation of photosensitive cells on the surfaces can be identified by its distinctive large, deeply lobed of the leaf or petiole that respond to morning sunlight basal leaves throughout the growing season from May (Zhang et al. 1991). Sessile leaves or leaves with through late September. The leaves blacken in fall. short petioles are oriented at random, indicating the importance of petiole torsion in orienting the lower, FQI Coefficient and Wetland Category: 9, UPL longer-petioled leaves. The compass orientation of the leaves increases water use efficiency, likely an Habitat: Throughout its range, compass plant is adaptation to the drought-prone prairie environment characteristic of prairie habitats. In Michigan, all (Jurik et al. 1990). The deep, fleshy tap roots exhibited populations of the species occur in degraded railroad by this species are also likely an adaptation to drought, rights-of-way or along roadsides, often with few and may be responsible for its survival and even native associates. At least some of these populations flowering during severe drought (Weaver et al. 1935, are thought to be adventive (Voss 1996). Associates Weaver 1958, Martin et al. 1991). in the few degraded prairie sites where the species is presumably native include Achillea millefolium Conservation/management: Michigan is at the (yarrow), Andropogon gerardii (big bluestem), northeastern edge of the native range of compass plant, Apocynum cannabinum (Indian hemp), Asclepias and the species was presumably never common in the verticillata (whorled milkweed), Dodecatheon meadia state. Fragmentation and conversion of prairie and (shooting star), Euphorbia corollata (flowering spurge), open savanna habitats to agricultural and urban land Hierochloe odorata (sweet grass), Monarda fistulosa following European settlement has further reduced the (wild bergamot), Ratibida pinnata (yellow coneflower), presence of the species in the state. All extant or recently Rubus flagellaris (northern dewberry), Schizachyrium extant populations of compass plant in Michigan occur scoparium (little bluestem), Silphium terebinthinaceum in railroad rights-of-way or along roadsides, where the (prairie dock), Solidago rigida (stiff goldenrod), plants are vulnerable to bulldozing, mowing, plowing, and Sorghastrum nutans (Indian grass). Due to fire herbicide use, and other anthropogenic disturbances. suppression and repeated disturbances, trees, shrubs, Frequent disturbance has reduced or eliminated native and aggressive non-native herbaceous species are the associates at several sites, and allowed invasion of most common associates at several sites. most sites by several aggressive, non-native species, including Agrostis gigantea (redtop), Berteroa incana Compass plant is more common west of Michigan. In (hoary alyssum), Bromus inermis (smooth brome), the Chicago region, compass plant is locally common in Centaurea maculosa (spotted knapweed), Daucus prairies, where it occurs with big bluestem, Aster laevis carota (Queen-Anne’s-lace), Hypericum perforatum (smooth aster), Calystegia sepium (hedge bindweed), (spotted St. John’s-wort), Melilotus alba (white Comandra umbellata (bastard toadflax), Eryngium sweet-clover), Poa compressa (Canada bluegrass), P. yuccifolium (rattlesnake-master), Dalea purpurea pratensis (Kentucky bluegrass), Saponaria officinalis (purple prairie-clover), flowering spurge, Hypoxis (bouncing bet), and Trifolium repens (white clover). hirsuta (yellow star-grass), Lespedeza capitata (round- Fire suppression and lack of management has further headed bush-clover), Lithospermum canescens (hoary contributed to the decline of compass plant by fostering Michigan Natural Features Inventory P.O. Box 30444 - Lansing, MI 48909-7944 Phone: 517-373-1552 compass plant, Page 3 an increase in shrub and tree cover in formerly open plants with pinnately lobed leaves but glabrous stems habitats. Dense clones of Rhus typhina (staghorn sumac) have been referred to S. pinnatifidum Elliott, or S. have degraded or eliminated several former prairie sites terebinthinaceum var. pinnatifidum, a primarily southern in railroad rights-of-way. species that may have evolved following hybridization (FNA Editorial Committee 2006). The genus Silphium Long-term protection of compass plant in Michigan is derived from the Greek sylphion, a resinous African requires management of remaining habitat to provide plant species. The specific epithetlaciniatum translates open conditions required by the species. Use of as “deeply slashed into slender segments,” a reference prescribed fire, manual removal of trees and shrubs, to the characteristic pinnatifid or bipinnatifid leaves and herbicide application targeting invasive herbaceous (Antonio and Masi 2001). species are recommended to restore, maintain, and enhance prairie habitats that support this species. Research needs: The primary need is an updated status Compass plant has been observed at only four of the survey at extant and historic locations. Presence/absence 13 documented sites since the early 1980s, and none of and population data were last collected at most sites these sites are being actively managed for the species or in the early 1980s. Research on the impacts of fire its habitat. All remaining populations of compass plant and other management techniques on populations of are vulnerable to railroad and roadside maintenance compass plant will provide land stewards with methods and encroachment of aggressive non-native species. for maintaining and enhancing populations of the Although deep taproots allow individuals to persist species. Numerous studies have been conducted on the through repeated disturbance events, including plowing, physiology, population biology, and autoecology of the short-distance
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