Callitriche peploides var. peploides

Lansdown, Richard V., 2022, The genus Callitriche (Plantaginaceae, Callitricheae) in Australasia and Oceania, Phytotaxa 547 (3), pp. 243-284 : 267

16a. Callitriche peploides var. peploides

≡ Callitriche drummondii Hegelmaier, Monogr. Callitriche 60. 1864.

Type: — U.S.A. Louisiana: Orleans Parish, New Orleans, [1832], T. Drummond s.n. (Lectotype [designated by Lansdown 2009: 367]: NY 248737!; isotypes: GH 48917 , GH 48918 ) .

Description: —Stem and leaf scales present. Leaf bases connate. Lingulate leaves unknown; expanded submerged or floating leaves unknown; leaves of terrestrial plants spathulate-obovate, 1.4–2.3 mm long × 0.4–0.8 mm wide, 3- veined, petiole 0.8–1.2 mm long. Most pairs of axils contain both ♂ and ♀ flowers opposed by a solitary ♀. Bracts lacking. Styles erect or patent, persistent, 0.2 mm long. Filament erect, 0.2 mm long; anthers 1.0 mm long × 1.0 mm wide, number of locules unknown; pollen yellow. Fruit strumose, subsessile, wider than high, black when ripe, 0.5–0.6 mm long × 0.7–0.8 mm wide, unwinged.

Illustrations: —Plate 1171 7(a–d) in Fassett 1951, Fig. 10f .

Recognition: — C. peploides can be distinguished from other Callitriche species in the region by the very small, unwinged, strongly strumose fruit, combined with most leaf axils containing both ♀ and ♂ flowers.

Distribution: —Non-native. Within the region, C. peploides var. peploides is known from a specimen from Nukumaru, Taranaki, North Island, New Zealand, found during work for this article (CHR 625887) ( Ogle et al. 2020). Its native range extends from South Carolina, Tennessee and southern Arkansas in the United States, south to Cuba and north-eastern Mexico ( Fassett 1951). It is widely naturalised in Madagascar, Reunion Island and in Taiwan.

Habitats and Ecology: —In New Zealand, the plant was described as locally co-dominant with Limosella lineata Glück (1934: 555) in lake bed “turf”, submerged much of the year but exposed in summer. In its native range, C. peploides occurs in seasonally inundated hollows or areas which are damp for much of the year, such as the edges of trails in closed canopy woodland or open savannah-type grassland, muddy areas where trails and tracks cross streams, seepages and flushes, as well as flower beds which are regularly watered. 0–100 m elevation.

Conservation Status: — Callitriche peploides subsp. peploides is classed as Least Concern ( IUCN 2012) as it is widespread with stable populations and does not face any major threats.

Selected specimens examined: — CHINA: TAIWAN. Chingmei, Taipei City , 24 March 1991, 0–50m, S.F. Huang 4470 ( TAI 219662 ) ; Shih-ting Hsiang, Taipei Co. , 10 December 1999, 300–450m, J.-c. Wang & C.-h. Chen ( TNU 11338, TNU 041261 ) ; National Taiwan Normal Univ. , 22 March 2000, J.-c. Wang ( TNU 11348) ; Taipei City 25° 01’ 50” N, 121° 34’ 0” E, 9 February 2001, S.-M. Ku 1156 ( PPI) . CUBA: S. Jolinis R., Matanzas, s.d., F. Rugel 234 ( BM) ; Plantae Cubensis , 1860–1864, C. Wright 2547 (P 04214924) . FRANCE: REUNION. Plaine des Palmistes , s.d., de Cordemoy s.n. (P 03900488) . GUATEMALA: Alta Verapaz Prov., February 1908, H. von Türkheim s.n. (G) . MADAGASCAR: Tananarive, June 1913, H. Perrier de la Bâthie, 2249 (P 03900494); Nr. Tananarive , alt. 1250– 1450m, 14 August 1924, H. Perrier de la Bâthie, H.Humbert 2199 (P 03900496, P 03900497); Tananarive, April 1927 H. Perrier de la Bâthie 18003 (P 03900489); Tananarive, 26 August 1928, R. Decary 6756 (P [P03900491]); Tananarive, 1500m alt., 20 June 1932, H. Perrier de la Bâthie 13207 (P 03900498); Tananarive, 1932, H. Perrier de la Bâthie 17795 (P 03900490); Bassin Supérieur du Sambirano, alt. 1700m, November–December 1937, H. Humbert 18667 (P 03900495); Tananarive, 7 September 1972, H. Jacquemin 1.101 (P P03900492) . MEXICO: 1956, Botteri 834 (P 04214927). MICHOACAN. Temascaltepec, San Miguel, L. Lano, 5 December 1934, G.B. Hinton 6854 (K). TAMAULIPAS. San Jose , 17 February 1939, H. LeSueur 126 ( GH) . VERACRUZ. Orizaba , August 1954, Botteri 834 ( BM) . NEW ZEALAND: NORTH ISLAND. Lake Waikato, Nukumaru, Waverley , Taranaki, NZMS 260: R22 630 513, 80 m, 10 March 2013, C.C. Ogle 6180 ( CHR 625887 ) . UNITED STATES OF AMERICA: ALABAMA. Auburn , Lee Co., 24 March 1897, F.S. Earle & C.F. Baker s.n. ( MO 1913626 ) . FLORIDA. Jacksonville, March, s.d., A.H. Curtiss 2462a ( MO 1913629 , P 04214920); Hibernia , March 1869, W.M. Canby s.n. ( MO 1913627 ) ; Jacksonville, 5 March 1894, A.H. Curtiss 4570 (P 04214926, P 04214922); Jacksonville, Florida , 13 March 1893, A.H. Curtiss 4310 ( MO 766874) ; Jacksonville , 13 April 1897, J.R. Churchill s.n. ( MO 1060127 ) . GEORGIA. Tebeauville , April 1869, W.M. Canby s.n. ( MO 1913630 ) . LOUISIANA. New Orleans , 1832, T. Drummond 115 ( BM) . MISSISSIPPI. Picayune , 21 March 1972, F.H. Sargent 10,514 ( MO 2455814 , BM) ; Russum , 2 April 1986, A.E. Brant & A.F. O’Donnell 821 ( MO 3526792 ) . TEXAS. Galveston Island , May 1843, F. Lindheimer s.n. ( MO 1913770 ) ; Houston , 1 April 1872, E. Hall 544 ( BM, MO 1913623 , MO 1913524 ) ; Baton Rouge , 21 January 1874, J.F. Joor s.n. ( MO 1913625 ) ; Houston , 27 March 1877, J.F. Joor s.n. ( MO 1913621 ) ; House Mountain, Llano Co., May 1885, R.J. Reverchon 1589 ( MO 1913622 , MO 3932421 , P 04214921); Houston , 17 April 1900, B.F. Bush 22 ( MO 1913620 ) ; Columbia , 20 April 1900, B.F. Bush 85 ( MO 1913619 ) ; Hungerford , 9 March 1914, E.J. Palmer 4893 ( MO 753698) ; Jacksonville , Texas, 24 December 1922 s.coll., s.n. (P 04214919); Jackson Co., 25 December 1923, J.A. Prushel 5014 ( MO 897817) ; Stockdale , 24 March 1947, R. McVaugh, 7641 (P 04214923); San Jacinto Co., 30 March 1935, B.C. Tharp 47003 ( MO 1303712 ) ; Smith’s Point , Chambers Co., 8 October 1936, B.C. Tharp 47006 ( MO 1303713 ) ; Austin , 10 March 1937, B.G. Tharp 47013 ( MO 1303855 ) ; Silsbee , 19 April 1964, D.S. Correll 29293 ( MO 2620939 ) ; Magnolia , 17 April 1964, D.S.. Correll 29347 ( MO 2620891 ) . Brazoria Nat. Wildlife Refuge , 23 April 1970, D.S. Correll, H.B. Correll & R. Fleetwood 38452-A ( MO 2375347 ) ; Brazoria Nat. Wildlife Refuge , 23 April 1970, D.S. Correll 38462, H.B. Correll & R. Fleetwood ( MO 2379848 ) .

Figures

FIGURE 10. Fruits of Callitriche in Oceania and Australasia: a—C. heterophylla, b—C. insularis, c—C. muelleri, d—C. palustris, e—C. papuana, f—C. peploides, g—C. petriei, h—C. platycarpa, i—C. sonderi, j—C. stagnalis, k—C. umbonata.