Silphium perplexum

Family:ASTERACEAE
Species:Silphium perplexum J.R. Allison
Common Name:Old Cahaba Rosinweed
Habitat:**
Associated Ecological Communities:**
Growth Habit:Herb
Duration:Perennial
Category:Vascular
USDA Symbol:**
Plant Notes:Old Cahaba Rosinweed is a native herbaceous perennial in the Aster family (Asteraceae). It is an Alabama endemic, known from three counties in west central Alabama. All known populations are located within nine miles of the Cahaba River. Old Cahaba Rosinweed is a perennial from a short rhizome. Basal leaves are usually absent at flowering. The stems are from one to eight feet in height, and are unbranched below the inflorescence. Stem leaves are lanceolate or ovate, opposite, and sessile or with short winged petioles. The leaf bases clasp the stem. The leaf margins may be entire or with a few teeth. The stems, leaves, and phyllaries are pubescent and glandular. The glands are stalked and amber colored. The entire plant has a resinous feel. Flowers are produced in heads. The heads are arranged in open panicles. Each plant may have from one to thirty heads. Ray and disc flowers are bright yellow. Rays average 19-23 per head. The fruit is an achene. Old Cahaba Rosinweed is similar to another Alabama endemic-- Sticky Rosinweed (Silphium glutinosum J.R. Allison). That species is known only from Bibb County. It is a shorter plant with fewer ray flowers and longer stalked glands. Old Cahaba Rosinweed is postulated to have arisen from hybridization between Sticky Rosinweed and Entire Leaf Rosinweed (Silphium integrifolium Michaux) as it is intermediate in most characteristics between those two species. Old Cahaba Rosinweed is listed as an S1 species in Alabama (typically 5 or fewer occurrences, very few remaining individuals, acres, or miles of stream, or some factor of its biology making it especially vulnerable in the state), and globally as a G1 species (critically imperiled globally because of extreme rarity (5 or fewer occurrences), or very few remaining acres, or miles of stream) or especially vulnerable to extinction because of some factor of its biology).--A. Diamond
Taxonomic Notes:**
Status:Native, Endemic, S1 (State Rank), G1 (Global Rank)
References:**
Specimen: View specimen details in the Alabama Herbarium Consortium Specimen Database

** Not applicable or data not available.

Classification

FamilyASTERACEAE - Aster family
Genus Silphium
Species Silphium perplexum J.R. Allison - Old Cahaba Rosinweed

Citation

Citation Silphium perplexum J.R. Allison, Castanea 66(1–2): 188–189, f. 12D–F. 2001.
Basionym: **
Type: ALABAMA: Dallas Co.: ca. 15.5 km SW of Selma and ca. 2.4 km WSW of Old Cahaba; S side Co. Rd. 2 at jct. Co. Rd. 9; prairielike openings over chalk, 18 Aug 1999, James R. Allison 12153 (holotype, GH; isotypes: AUA, DUKE, FLAS, FSU, GA, JSU, MICH, MO, NY, UNA, US, VDB).

** Not applicable or data not available.

Synonyms

No synonyms exist for this species.

Specimens and Distribution

This species has been reported in the following counties by the herbaria listed. An overview of the individual specimens are provided in the table that follows. Click on the accession number to view details; click on column headers to sort; choose a county or herbaria to filter the specimen data.

Counties included on distribution map: Bibb, Dallas, Perry

Counties represented by specimen data listed below:

Herbaria represented by specimen data listed below: AUA, NY, TROY, UNA, UWAL

Range of years during which specimens were collected: -

Barcode / Accession No. County Coll. Date Collector &
Collection No.
Herbarium &
Herbarium Name Used
Image
AUA000007391 Perry 19 AUG 1999 ALLISON, JAMES R.
12161
AUA
SILPHIUM PERPLEXUM J. ALLISON
UWAL0018009 Perry 29 Jul 1972 Kral, R.
47891
UWAL
Silphium perplexum J. Allison
UNA00055852 Perry _-_-1995 James R. Allison
8119
UNA
Silphium perplexum J. Allison
UNA00060014 Perry 8 Oct 2000 James R. Allison
12583
UNA
Silphium perplexum J. Allison
UWAL0030308 Dallas 24 Jul 2015 Keener, Brian R.
9043
UWAL
Silphium perplexum J.Allison
AUA000007392 Perry 19 AUG 2001 ALLISON, JAMES R.
12161
AUA
SILPHIUM PERPLEXUM J. ALLISON
UWAL0018010 Perry 29 Jul 1972 Kral, R.
47891
UWAL
Silphium perplexum J. Allison
UWAL0018007 Dallas 06 Oct 1972 Kral, R.
48820
UWAL
Silphium perplexum J. Allison
UNA00057718 Perry _-_-1995 James R. Allison
8119
UNA
Silphium perplexum J. Allison
UNA00060015 Perry 8 Oct 2000 James R. Allison
12583
UNA
Silphium perplexum J. Allison
UNA00049395 Bibb 4 Aug 1996 John R. MacDonald
9822
UNA
Silphium perplexum J. Allison
AUA000007341 Perry 21 AUG 1994 ALLISON, JAMES R.
8564
AUA
SILPHIUM PERPLEXUM J. ALLISON
UWAL0016544 Dallas 13 Aug 2014 Diamond, Alvin R.
25440
UWAL
Silphium perplexum J.R. Allison
UNA00060060 Dallas 18 Aug 1999 James R. Allison
12153
UNA
Silphium perplexum J. Allison
AUA_ACC061458 Dallas 18 AUG 1999 ALLISON, JAMES R.
12153
AUA
SILPHIUM PERPLEXUM J. ALLISON
AUA000007344 Perry 21 AUG 1994 ALLISON, JAMES R.
8564
AUA
SILPHIUM PERPLEXUM J. ALLISON
UNA00060052 Perry 19 Aug 1999 James R. Allison
12160
UNA
Silphium perplexum J. Allison
TROY000041585 Dallas 13 Aug 2014 Alvin R. Diamond
25440
TROY
Silphium perplexum J.R. Allison
AUA000007342 Perry 21 AUG 1994 ALLISON, JAMES R.
8564
AUA
SILPHIUM PERPLEXUM J. ALLISON
UWAL0016545 Dallas 13 Aug 2014 Diamond, Alvin R.
25441
UWAL
Silphium perplexum J.R. Allison
UNA00060050 Dallas 18 Aug 1999 James R. Allison
12155
UNA
Silphium perplexum J. Allison
AUA000007390 Dallas 18 AUG 1999 ALLISON, JAMES R.
12155
AUA
SILPHIUM PERPLEXUM J. ALLISON
AUA000007393 Perry 8 OCT 2000 ALLISON, JAMES R.
12583
AUA
SILPHIUM PERPLEXUM J. ALLISON
NY00688599 Dallas 18 Aug 1999 James R. Allison
12153
NY
Silphium perplexum J.R.Allison
UNA00060053 Perry 19 Aug 1999 James R. Allison
12161
UNA
Silphium perplexum J. Allison
TROY000041595 Dallas 13 Aug 2014 Alvin R. Diamond
25441
TROY
Silphium perplexum J.R. Allison
AUA000007343 Perry 21 AUG 1994 ALLISON, JAMES R.
8564
AUA
SILPHIUM PERPLEXUM J. ALLISON
UNA00060051 Dallas 18 Aug 1999 James R. Allison
12155
UNA
Silphium perplexum J. Allison
AUA000007389 Dallas 18 DEC 1999 ALLISON, JAMES R.
12155
AUA
SILPHIUM PERPLEXUM J. ALLISON
UWAL0018008 Perry 29 Jul 1972 Kral, R.
47891
UWAL
Silphium perplexum J. Allison
NY00688600 Dallas 18 Aug 1999 James R. Allison
12153
NY
Silphium perplexum J.R.Allison
UNA00060054 Perry 19 Aug 1999 James R. Allison
12161
UNA
Silphium perplexum J. Allison
UWAL0030304 Dallas 24 Jul 2015 Keener, Brian R.
9036
UWAL
Silphium perplexum J.Allison
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