Wikipedia

Plantago triandra

Plantago triandra is a species of flowering plant in the family Plantaginaceae that is endemic to New Zealand. Sven Berggren described the species in 1877. Plants of this species of plantain are perennial with a rosette habit, with angular-ovate leaves, tiny calyces, numerous seeds, and often sessile flowers and fruiting capsules. The species is considered to be not threatened.

Plantago triandra
Plantago triandra in flower from Southland, New Zealand

Not Threatened (NZ TCS)
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Lamiales
Family: Plantaginaceae
Genus: Plantago
Species:
P. triandra
Binomial name
Plantago triandra
Synonyms
  • Plantago masoniae Cheeseman[2]
  • Plantago triandra subsp. masoniae[3]

Taxonomy edit

Plantago triandrais in the plant family Plantaginaceae.[4] It was first described by Swedish botanist Sven Berggren in 1877.[1]

 
Possible isotype of P. triandra at Te Papa
 
Holotype of P. masoniae, a synonym of P. triandra, from Auckland Museum herbarium

The holotype was collected by Sven Berggren at Kelly's Hill, Canterbury, South Island in February 1874. The holotype is located at the herbarium at Lund University Biological Museum (LD),[5][6] and there are possible isotypes at herbaria at Royal Botanical Gardens, Kew (K)[7] and the Museum of New Zealand Te Papa Tongarewa (WELT).[8][9]

Plantago masoniae Cheeseman and P. triandra subsp. masoniae (Cheeseman) W.R.Sykes[3] are considered to be synonyms of P. triandra.[9] The holotype of P. masoniae is housed at the Auckland War Memorial Museum (AK).[10][11]

 
Plantago triandra in fruit
 
Mat of Plantago triandra rosettes

Plantago triandra is morphologically most similar to P. obconica and P. unibracteata.[3][9] It can be distinguished from those species and other New Zealand Plantago species by tiny calyx and many seeds. The calyx of P. triandra is very tiny, only 0.4–1.8 mm long, which is smaller than that of the other species. It also has between 8 and 42 uniform, angular seeds in each capsule (average 26) which is more than the other species.[9]

It can be further distinguished from P. obconica by its leaves which are widest below the middle (rather than above the middle).[9] It can be further distinguished from P. unibracteata by its many leaf teeth, usually 10 or more (rather than 4-10 leaf teeth).[9]

Description edit

Plantago triandra plants are small rosettes with a primary root up to 12 mm thick, with up to 62 usually angular-ovate leaves, and with visible, short (<13 mm long), rust-coloured leaf axillary hairs in the basal rosette. The leaves have 1 vein, are 8–61 mm long (including petiole) and up to 11 mm wide, sometimes punctate, glabrous on both surfaces or with bands of hairs to sparsely hairy on the upper surface. The leaf has an acute apex, and its edges are smooth, wavy or with up to 24 small to large teeth. The petiole is usually distinguishable from the leaf lamina, and up to 23 mm long. Each rosette plant has up to 22 erect inflorescences which can be up to 41 mm long. The scapes are smooth and glabrous or hairy. The spikes are globose with 1–3 densely crowded flowers. Each flower has a small bract that is broadly ovate to very broadly ovate and usually glabrous. The calyx is 0.3–1.7 mm long, 0.3–1.1 mm wide, mostly glabrous but rarely with a hair at the apex. The corolla tube is 2.0–4.4 mm long, corolla lobes 0.9–2.9 mm long, stamen filaments 1.7–6.8 mm long, anthers 0.7–1.4 mm long, and style 2.7–10.0 mm long and densely hairy. The ovary is 0.7–2.6 mm long, with up to 42 ovules. The fruit is a dry, dehiscent capsule with circumsessile dehiscence, ellipsoid or globose, widest at middle, 2.1–4.3 mm long and 1.5–3.9 mm wide. Each capsule has 8–42 uniform rust or brown seeds 0.5–1.4 mm long, usually rhomboid or angular-ovoid.[9]

Plantago triandra flowers from December to May and fruits from December to June.[9]

The chromosome number of Plantago triandra is 2n=48.[12][13][14]

Distribution and habitat edit

 
Plantago triandra rosettes in riverside herbaceous turf

Plantago triandra is a plantain that is endemic to the North, South, Stewart and Chatham Islands of New Zealand. In the North Island it is found in Auckland, Volcanic Plateau, Taranaki, and Southern North Island regions, whereas on the South Island it is found in Marlborough, Western Nelson, Westland, Canterbury, Otago, Fiordland, and Southland regions.[9]

 
Plantago rosettes in a coastal turf habitat

It is found on coastal banks, cliffs, herbfields, dunes and rock outcrops in damp or wet areas, from sea level to 1520 m above sea level.[9] It can also be found in bowling or golf course greens.[9]

Phylogeny edit

Plantago triandra was included in phylogenetic analyses of Australasian species of Plantago using standard DNA sequencing markers (nuclear ribosomal DNA, chloroplast DNA, and mitochondrial DNA regions).[15] In that study, Plantago triandra was moderately to strongly supported as sister or closely related to another New Zealand species, Plantago unibracteata.[15]

Similarly, Plantago triandra was closely related to P. unibracteata in a phylogenetic study of the New Zealand species using amplified fragment length polymorphisms (AFLPs).[16] These two species formed a clade with high support, but the species themselves were not monophyletic. It was hypothesized that decaploid and dodecaploid P. unibracteata are allopolyploids that have evolved multiple times from octoploid P. triandra and another species.[16]

Individuals of P. triandra and P. unibracteata could not be distinguished in another study using only nuclear ribosomal DNA (internal transcribed spacer region) with several individuals of each species sampled.[17] However, the sole individual of P. triandra was not sister to the sole individual of P. unibracteata in another phylogenetic study focusing on Plantago species throughout the world using whole chloroplast genomes, although they were in the same larger clade.[18] Finally, the species was not included in another phylogenetic studies focusing on oceanic island Plantago species using standard DNA sequencing markers.[19]

Conservation status edit

Plantago triandra is listed as Not Threatened in the most recent assessment (2017–2018) of the New Zealand Threatened Classification for plants.[20]

Gallery edit

References edit

  1. ^ a b Berggren, Sven (1877). "Några nya eller ofullständigt kända arter af ny-zeeländska fanerogamer". Kungliga Fysiografiska sällskapets i Lund förhandlingar. 8: 21–24.
  2. ^ Cheeseman, T. F. (1921). "New Species of Flowering-plants". Transactions and Proceedings of the New Zealand Institute. 53: 423–425. ISSN 1176-6158. Wikidata Q115628331.
  3. ^ a b c Sykes, William Russell (1 April 1988). "Notes on New Zealand Plantago species". New Zealand Journal of Botany. 26 (2): 321–323. Bibcode:1988NZJB...26..321S. doi:10.1080/0028825X.1988.10410121.
  4. ^ "Plantago triandra". New Zealand Plant Conservation Network. Retrieved 13 February 2024.
  5. ^ "Holotype of Plantago triandra. Occurrence Detail 788460618". www.gbif.org. Retrieved 14 February 2024.
  6. ^ "Holotype of Plantago triandra Berggr. [family PLANTAGINACEAE] on JSTOR". plants.jstor.org. Retrieved 14 February 2024.
  7. ^ "Isotype of Plantago triandra Berggr. [family PLANTAGINACEAE] on JSTOR". plants.jstor.org. Retrieved 14 February 2024.
  8. ^ "Possible isotype of Plantago triandra. Occurrence Detail 4520687221". www.gbif.org. Retrieved 14 February 2024.
  9. ^ a b c d e f g h i j k Meudt, Heidi (June 2012). "A taxonomic revision of native New Zealand Plantago (Plantaginaceae)". New Zealand Journal of Botany. 50 (2): 101–178. Bibcode:2012NZJB...50..101M. doi:10.1080/0028825X.2012.671179. S2CID 84968326.
  10. ^ "Holotype of Plantago triandra Berggren [family PLANTAGINACEAE] on JSTOR". plants.jstor.org. Retrieved 14 February 2024.
  11. ^ "Holotype of Plantago masoniae Cheeseman on JSTOR". plants.jstor.org. Retrieved 14 February 2024.
  12. ^ Rattenbury, J. A. (1957). "Chromosome Numbers in New Zealand Angiosperms". Transactions of the Royal Society of New Zealand. 84: 936–938.
  13. ^ Groves, B. E.; Hair, J. B. (1971). "Contributions to a Chromosome Atlas of the New Zealand Flora—15 Miscellaneous Families". New Zealand Journal of Botany. 9 (4): 569–575. Bibcode:1971NZJB....9..569G. doi:10.1080/0028825X.1971.10430222.
  14. ^ Murray, B. G.; Meudt, Heidi; Tay, Mei Lin; Garnock-Jones, Philip John (2010). "New chromosome counts in New Zealand species of Plantago (Plantaginaceae)". New Zealand Journal of Botany. 48 (3–4): 197–204. Bibcode:2010NZJB...48..197M. doi:10.1080/0028825X.2010.515598.
  15. ^ a b Tay, Mei Lin; Meudt, Heidi; Garnock-Jones, Philip John; Ritchie, Peter (1 January 2010). "DNA sequences from three genomes reveal multiple long-distance dispersals and non-monophyly of sections in Australasian Plantago (Plantaginaceae)". Australian Systematic Botany. 23 (1): 47. doi:10.1071/SB09040.
  16. ^ a b Meudt, Heidi (1 February 2011). "Amplified Fragment Length Polymorphism Data Reveal a History of Auto- and Allopolyploidy in New Zealand Endemic Species of Plantago (Plantaginaceae): New Perspectives on a Taxonomically Challenging Group". International Journal of Plant Sciences. 172 (2): 220–237. doi:10.1086/657657. S2CID 85402923.
  17. ^ Tay, Mei Lin; Meudt, Heidi; Garnock-Jones, Philip John; Ritchie, Peter (2010). "Testing species limits of New Zealand Plantago (Plantaginaceae) using internal transcribed spacer (ITS) DNA sequences". New Zealand Journal of Botany. 48 (3–4): 205–224. Bibcode:2010NZJB...48..205T. doi:10.1080/0028825X.2010.518318.
  18. ^ Hassemer, Gustavo; Bruun-Lund, Sam; Shipunov, Aleksey Borisovich; Briggs, Barbara G.; Meudt, Heidi; Rønsted, Nina (18 May 2019). "The application of high-throughput sequencing for taxonomy: The case of Plantago subg. Plantago (Plantaginaceae)". Molecular Phylogenetics and Evolution. 138: 156–173. doi:10.1016/J.YMPEV.2019.05.013. PMID 31112781.
  19. ^ Ahlstrand, Natalie Iwanycki; Verstraete, Brecht; Hassemer, Gustavo; Dunbar-Co, S.; Hoggard, R.; Meudt, Heidi; Rønsted, Nina (15 March 2019). "Ancestral range reconstruction of remote oceanic island species of Plantago (Plantaginaceae) reveals differing scales and modes of dispersal". Journal of Biogeography. 46 (4): 706–722. Bibcode:2019JBiog..46..706I. doi:10.1111/JBI.13525. PMC 6559316. PMID 31217659.
  20. ^ Lange, Peter J. de; Rolfe, Jeremy R.; Barkla, John W.; Courtney, Shannel P.; Champion, Paul D.; Perrie, Leon R.; Beadel, Sarah M.; Ford, Kerry A.; Breitwieser, Ilse; Schönberger, Ines; Hindmarsh-Walls, Rowan (May 2018). "Conservation status of New Zealand indigenous vascular plants, 2017" (PDF). New Zealand Threat Classification Series. 22: 1–86. OCLC 1041649797.

External links edit

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