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72  Hippuridaceae (Draft: R. Elven)

THIS DRAFT HAS NOT BEEN DISCUSSED

72.1  Hippuris L. (1753), Sp. Pl. 4.
The Hippuris vulgaris aggregate (H. x lanceolata, H. tetraphylla, H. vulgaris)

Comments:

(1) The two species H. vulgaris and H. tetraphylla are quite different and the hypothesis that they are only ecological modifications is countered by the frequent occurrence of morphologically typical H. vulgaris in saline waters. The assumed hybrid H. x lanceolata sometimes occurs with the assumed parents but more often without. I therefore propose that we accept it as a taxon until its background is much more better known that at present. (Elven)
72.1.1  Hippuris vulgaris L. (1753), Sp. Pl. 4.

S

2n= 32 (4x).



2nD Löve & Löve (1975) list numerous counts, many as arctic; Lövkvist & Hultgård (1999 S Sweden).

G ICE NOR RUS SIB RFE ALA CAN GRL

Comments:
72.1.2  Hippuris tetraphylla L. fil. (1781), Suppl. 81.

S

T [Described from Sweden and Finland: Baltic Sea.]



2n= 32 (4x).

2nD Löve & Löve (1975) list four counts, three as arctic.

G ICE RUS SIB RFE ALA CAN

Comments:


72.1.3  Hippuris x lanceolata Retz. (1783), Obs. 3: 7.

S ?H. tetraphylla L. fil. x H. vulgaris L.

2n=

2nD


G NOR RUS SIB RFE ALA CAN?

Comments:

(1) In North Norway this entity occurs quite independent of its proposed parents, rarely in company with any of them and distinctly outside the range of H. tetraphylla. It is intermediate but I am not convinced of its hybrid origin. (Elven)
72.1.4  Hippuris montana Ledeb. ex Rchb. (1823), Icon. Fl. Germ. Helv. 1: 71, t. 86, f. 181.

S

T [Described from Alaska: Unalaska.]



2n=

2nD


G ALA

Comments:

(1) Mapped for St. Matthew Isl. by Hultén (1968). This seems to be the only site within the Arctic. The record is omitted by Porsild & Cody (1980). Alaskan opinions? (Elven)

WARNING! Will be excluded if not confirmed from Alaska: St. Matthew Island.

73  Cornaceae (Draft: R. Elven)

THIS DRAFT HAS NOT BEEN DISCUSSED

73.1  Cornus L. (1753), Sp. Pl. 117.

S Chamaepericlymenum Hill (1756), Brit. Herb. 331 (incl.); Swida Opiz in Bercht. & Opiz (1838), Oekon. Techn. Fl. Böhm. 2, 1: 174 (incl.); Thelycrania (Dumort.) Fourr. (1868), Ann. Soc. Linn. Lyon, sér. 2 , 16: 394 (incl.).

Comments:

(1) Here treated collectively but I am ready to accept Chamaepericlymenum and possibly also Swida as separate genera. (Elven)


The Cornus suecica aggregate (C. canadensis, C. suecica, C. x unalaschkensis)

Comments:

(1) Cornus suecica and C. canadensis are obviously closely related genetically, as demonstrated by the frequent hybrid C. x unalaschkensis. The hybrid occurs distinct in areas where the parents are missing and therefore merits rank as a separate taxon. (Elven)
73.1.1  Cornus suecica L. (1753), Sp. Pl. 118.

S Chamaepericlymenum suecicum (L.) Graebn. in Asch. & Graebner, (1899), Fl. Nordostdeut. Flachl. 539.

2n= 22 (2x).

2nD Löve & Löve (1975) list six counts, three as arctic.

G ICE NOR RUS RFE ALA CAN GRL

Comments:


73.1.2  Cornus canadensis L. (1753), Sp. Pl. 118.

S Chamaepericlymenum canadense (L.) Graebn. in Asch. & Graebn. (1899), Fl. Nordostdeut. Flachl. 799.

2n= 44 (4x).

2nD Löve & Löve (1975) list several counts, one as arctic.

G ALA CAN GRL

Comments:


73.1.3  Cornus x unanaschkensis Ledeb. (1844), Fl. Ross. 2: 378.

S Chamaepericlymenum x unalaschkense (Ledeb.) Rydb. (1917), Fl. Rocky Mts. 635; C. canadensis L. x suecica L.

2n= 22 (2x).

2nD Löve & Löve (1975) list four counts, one as arctic.

G ALA CAN GRL

Comments:

(1) This obvious hybrid occurs outside the range of at least one of its parents (C. canadensis) and should be accepted as an 'entity' in the checklist. The reports of a diploid chromosome number is a little problematic if it is a hybrid between a diploid and a tetraploid. (Elven)
73.1.4  Cornus alba L. (1767), Mant. 40.

S Swida alba (L.) Opiz (1852), Seznam 94; Thelycrania alba (L.) Pojark. (1950), Bot. Mater. Gerb. Glavn. Bot. Sada SSSR 12: 172.

2n= 22 (2x).

2nD Meurman (1930); Dermen (1932).

G RUS?

Comments:



(1) Index Kewensis gives the original publication as: Opiz (1852), Seznam 94. It was probably published already in: Bercht. & Opiz (1838), Oekon.-Techn. Fl. Böhm. 2, 1. (Elven)

(1) Approaches or reaches the Arctic in NE Russia (Bolshezemelskaya Tundra), acc. to Hultén & Fries (1986 map 1379). (Elven)


73.1.5  Cornus sericea L. (1771), Mant. Alt. 199.

S Cornus stolonifera Michx. (1803), Fl. Bor. Amer. 1: 92; Thelycrania stolonifera (Michx.) Pojark. (1950), Bot. Mater. Gerb. Glavn. Bot. Sada SSSR 12: 165; Thelycrania sericea (L.) Dandy (1957), Watsonia 4: 47; Swida sericea (L.) Holub (1967), Folia Geobot. Phytotax. 2: 427.

2n=

2nD


G ALA CAN

Comments:



(1) A border case in at least three areas: Yukon River delta, southern Brooks Range and the Hudson Bay region. Must therefore be included. (Elven)


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