Silphium perplexum

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Distribution Map: Based on vouchered plant specimens only. View county names by placing the mouse cursor over a particular county.

Species Distribution Map
Family:ASTERACEAE
Species:Silphium perplexum J.R. Allison
Common Name:Old Cahaba Rosinweed
Habitat:Glades and prairies.
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: USA: 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: Dallas, Perry

Counties represented by specimen data listed below:

Herbaria represented by specimen data listed below: ALNHS, 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
AUA000007389 Dallas 18 Dec 1999 Allison, James R.
12155		 AUA
Silphium Perplexum J. Allison
UNA00055852 Perry _ _ 1995 Allison, James R.
8119		 UNA
Silphium perplexum J. Allison
UNA00060053 Perry 19 Aug 1999 Allison, James R.
12161		 UNA
Silphium perplexum J. Allison
AUA000007391 Perry 19 Aug 1999 Allison, James R.
12161		 AUA
Silphium Perplexum J. Allison
UNA00057718 Perry _ _ 1995 Allison, James R.
8119		 UNA
Silphium perplexum J. Allison
UNA00060054 Perry 19 Aug 1999 Allison, James R.
12161		 UNA
Silphium perplexum J. Allison
TROY000041595 Dallas 13 Aug 2014 Diamond, Alvin R.
25441		 TROY
Silphium perplexum J.R. Allison
TROY000048284 Dallas 17 Sep 2019 Diamond, Alvin R.
29092		 TROY
Silphium perplexum J.R. 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
UNA00060052 Perry 19 Aug 1999 Allison, James R.
12160		 UNA
Silphium perplexum J. Allison
UWAL0030304 Dallas 24 Jul 2015 Keener, Brian R.
9036		 UWAL
Silphium perplexum J.Allison
UWAL0016545 Dallas 13 Aug 2014 Diamond, Alvin R.
25441		 UWAL
Silphium perplexum J.R. Allison
AUA000007392 Perry 19 Aug 2001 Allison, James R.
12161		 AUA
Silphium Perplexum J. Allison
UNA00060014 Perry 08 Oct 2000 Allison, James R.
12583		 UNA
Silphium perplexum J. Allison
ALNHS00005210 Dallas 20 SEP 2017 Barger, T. Wayne
SP#3424		 ALNHS
Silphium perplexum J. Allison
UWAL0030308 Dallas 24 Jul 2015 Keener, Brian R.
9043		 UWAL
Silphium perplexum J.Allison
NY00688599 Dallas 18 Aug 1999 James R. Allison
12153		 NY
Silphium perplexum J.R.Allison
AUA000007343 Perry 21 Aug 1994 Allison, James R.
8564		 AUA
Silphium Perplexum J. Allison
UNA00060050 Dallas 18 Aug 1999 Allison, James R.
12155		 UNA
Silphium perplexum J. Allison
UWAL0018008 Perry 29 Jul 1972 Kral, Robert
47891		 UWAL
Silphium perplexum J. Allison
TROY000041585 Dallas 13 Aug 2014 Diamond, Alvin R.
25440		 TROY
Silphium perplexum J.R. Allison
NY00688600 Dallas 18 Aug 1999 James R. Allison
12153		 NY
Silphium perplexum J.R.Allison
AUA000030967 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
UNA00060051 Dallas 18 Aug 1999 Allison, James R.
12155		 UNA
Silphium perplexum J. Allison
UWAL0018009 Perry 29 Jul 1972 Kral, Robert
47891		 UWAL
Silphium perplexum J. Allison
UWAL0018010 Perry 29 Jul 1972 Kral, Robert
47891		 UWAL
Silphium perplexum J. Allison
AUA000007342 Perry 21 Aug 1994 Allison, James R.
8564		 AUA
Silphium Perplexum J. Allison
UNA00060060 Dallas 18 Aug 1999 Allison, James R.
12153		 UNA
Silphium perplexum J. Allison
UWAL0018007 Dallas 06 Oct 1972 Kral, Robert
48820		 UWAL
Silphium perplexum J. Allison
UWAL0016544 Dallas 13 Aug 2014 Diamond, Alvin R.
25440		 UWAL
Silphium perplexum J.R. Allison
AUA000007341 Perry 21 Aug 1994 Allison, James R.
8564		 AUA
Silphium Perplexum J. Allison
UNA00060015 Perry 08 Oct 2000 Allison, James R.
12583		 UNA
Silphium perplexum J. Allison
ALNHS00002273 Dallas 21 Jul 2010 Barger, T. Wayne
OC-444		 ALNHS
Silphium perplexum J. Allison
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