Rodionenkoa M.B.Crespo, Mart.

Crespo, Manuel B., Martínez-Azorín, Mario & Mavrodiev, Evgeny V., 2015, Can a rainbow consist of a single colour? A new comprehensive generic arrangement of the ‘ Iris sensu latissimo’ clade (Iridaceae), congruent with morphology and molecular data, Phytotaxa 232 (1), pp. 448-450 : 448-450

23. Rodionenkoa M.B.Crespo, Mart. -Azorín & Mavrodiev, gen. nov. [ Iris sect. Monospatha Rodion., Rod Iris : 194 (1961)]. Type (holotype):— R. tenuis (S.Watson) M.B.Crespo, Mart. -Azorín & Mavrodiev [≡ I. tenuis S.Watson in Proc. Amer. Acad. Arts 27: 380 (1882)]

Genus Japoniae et Americae boreo-occidentalis ab Iride s. str. bene distinctus et valde differt rhizomate tenuissimo, longo, valde ramoso, ramis funiculiformibus, nodosis, ad nodos incrassatis et plerumque radicantibus; foliis herbaceis, mollibus linearibusque; floribus terminalibus, tubo perigonii breve, cylindrico, ad faucem dilatato, exterioribus segmentis perigonii majoribus, erecto-patentibus, emarginatis, crista unica centrali prominente, integra vel irregulariter erosa, interioribus patentibus vel subpatentibus, minoribus, a basi breve unguiculato-canaliculatis; stigmatibus quam segmentis exterioribus dimidio brevioribus; capsula ovoidea vel subglobosa, subcoriacea, costis parce prominulis, oscure trigona, e apice deorsum a medio valde dehiscente; seminibus angulosis, compressis, minute foveolatis, rhaphide albicante vel lutescente instructis. Numerus basicus chromosomatum, p = 7. Nomen genericum a Georgi Ivanovich Rodionenko (1913–2014) ex animo dicatum.

Rhizomatous herbs, with deciduous aerial structures. Rhizome very slender, long, heterogeneous, with cord-like branches at apex, swollen at nodes, clothed with brown, scale-like leaves; roots fibrous or somewhat fleshy, sometimes arising from nodes. Stems aerial, elongated, simple or 1–3-branched, solid, ± rounded in cross section. Leaves isobilateral, herbaceous, narrowly linear, without prominent ribs, not fetid; caulinar well-developed, equitant. Flowers terminal on branches, shortly pedicellate. Spathe valves 1–2, ± scarious except the base and the midrib, ± keeled, sometimes fused basally. Perigone in 2 rows, differing in size and shape, fused in a short cylindric tube, widened at the apex; falls erect-patent, oblong-spatulate, slightly reflexed towards apex, deeply emarginate, gradually tapering into a short claw, with a central ridge, almost entire or irregularly wavy; standards patent to erecto-patent, oblanceolate-spatulate, narrowed into a short canaliculate haft. Stamen filaments free, adnate to the fall bases. Ovary trilocular, with axile placentation. Style filiform, with 3 petaloid branches, about half longer than falls, each one concealing a stamen; crests short, incurved, broadly obovate, irregularly fringed on margins; stigma oblong to triangular-acuminate, entire. Capsule depressed-globose to ovoid, without prominent ribs, subtrigonous, dehiscing from apex to about middle, usually not hidden into spathes, unbeaked; pericarp subcoriaceous. Seeds numerous, angulose, flattened, with whitish to yellowish raphe; testa surface pitted. p = 7. Figs. 2K , 5K , 6N , 25C.

A NEW GENERIC ARRANGEMENT OF IRIS SENSU LATISSIMO

Phytotaxa 232 (1) © 2015 Magnolia Press • 65

It includes 2 species, one found in western North America (Clackamas, Oregon), and the other in Japan (Hokkaido, Honshu and Kyushu) ( Fig. 26A ).

Needed new combinations:— Rodionenkoa sect. Monospatha (Rodion.) M.B.Crespo, Mart. -Azorín & Mavrodiev, comb. nov. Basionym: Iris sect. Monospatha Rodion., Rod Iris : 194 (1961). Type (holotype):— R. gracilipes (A.Gray) M.B.Crespo, Mart. -Azorín & Mavrodiev. Rodionenkoa gracilipes (A.Gray) M.B.Crespo, Mart. -Azorín & Mavrodiev, comb. nov. Basionym: Iris gracilipes A.Gray, Mem. Amer. Acad. Arts ser. 2, 6(2): 412 (1859). Rodionenkoa tenuis (S.Watson) M.B.Crespo, Mart. -Azorín & Mavrodiev, comb. nov. Basionym: Iris tenuis S.Watson, Proc. Amer. Acad. Arts 27: 380 (1882).

Figures

FIGURE 2. External morphology of rootstock (bulbs, rhizomes and roots). A) Iridodictyum reticulatum, bulb with reticulate outer tunics (photo: Ken Walker); B) Xiphion heracleanum, bulb with membranous outer tunics and stem bulbil (photo: Manuel B. Crespo); C) Juno narbutii, bulb with persistent fleshy roots (photo: Ken Walker); D) Juno rosenbachiana, bulb with persistent fleshy roots (photo: Ken Walker); E) Limniris pseudacorus, rhizome with swollen annulate annual growths (photo: G.–U. Tolkiehn); F) Hermodactylus tuberosus, rhizome with pseudodigitate tubercles (photo: Attilio Marzorati); G) Junopsis barbatula, fleshy tuberous roots surrounding the inconspicuous central rhizome (photo: Ken Walker); H) Phaeiris hexagona, rhizome with fibrous remains of old leaves on scars, and fibrosus roots (photo: Ken Walker); I) Siphonostylis lazica, rhizome dichotomously branched and fibrous roots (photo: Ken Walker); J) Zhaoanthus odaesanensis, slender stoloniferous rhizomes with long, thin roots bearing nodules (photo: Christy Hensler); K) Rodionenkoa gracilipes, heterogeneous rhizome with cord-like branches (photo: Ken Walker); L) Cryptobasis bungei, short rizhomes with reddish-brown remains of leaf sheaths forming an apical neck-like structure (MO s.n.).

FIGURE 5. Flower morphology: falls, standards and stylar branches, sometimes with spathe bracts (cont.). A) Hermodactylus tuberosus (photo: Paul Tyerman); B) Syrianthus grant-duffii (photo: Gideon Pisanty); C) Xiphion xiphium (photo: Mario Martínez- Azorín); D) Xiphion heracleanum (photo: Alicia Vicente); E) Alatavia kolpakowskiana (photo: Joyce Fingerut); F) Chamaeiris foetidissima (photo: Mario Martínez-Azorín); G) Chamaeiris graminea (photo: José Quiles); H) Chamaeiris reichenbachiana (photo: José Quiles); I) Chamaeiris anguifuga (photo: Jim Murrain); J) Dielsiris longipetala (photo: Ken Walker); K) Rodionenkoa gracilipes (photo: Ken Walker); L) Lophiris cristata (photo: Ken Walker).

FIGURE 6. Carpology. A) Belamcanda chinensis, seeds black, long persistent on the central axis of fruit (photo: Stanislav Doronenko); B) Pardanthopsis dichotoma, seeds shortly winged (photo: Ken Walker); C) Gattenhofia verna var. smalliana, seeds with fleshy raphe and ribbed surface (photo: Ken Walker); D) Tectiris tectorum, seeds glossy, pyriform, apiculate, with inconspicuous aril (photo: Ken Walker); E) Evansia wattii, seeds matte, angulose, with small aril (photo: Dennis Kramb); F) Chamaeiris foetidissima, seeds reddish, persistent on valves of the opened fruit (photo: Ken Walker); G) Chamaeiris halophila, seeds with papery, loose testa (photo: David Pilling); H) Hermodactylus tuberosus, seeds globose with gelatinous aril (photo: Ken Walker); I) Lophiris cristata, seeds with long coiled appendage (photo: Jan Sacks); J) Zhaoanthus speculatrix, seeds with aril withering early as a wing (photo: Ken Walker); K) Phaeiris giganticaerulea, seeds large, flattened, with thickened, corky testa (photo: Robert R. Pries); L) Joniris uniflora, seeds with fleshy raphe vanishing on drying (photo: Robert R. Pries); M) Limniris sibirica, seeds discoidal, without aril, with subcorky testa (photo: Ken Walker); N) Rodionenkoa gracilipes, seeds with fleshy raphe and testa surface pitted (photo: Robert R. Pries); O) Junopsis collettii, seeds oblong with conspicuous whitish aril (photo: Ken Walker); P) Zhaoanthus koreanus, seeds globosecompressed, with fleshy raphe withering early as a wing (photo: Robert R. Pries); Q) Iris hoogiana, seeds with prominent aril and testa surface reticulate-wrinkled (photo: Robert R. Pries); R) Iris pumila, seeds without aril and testa surface reticulate-wrinkled (photo: Steve Hurst); S) Juno bucharica, seeds apiculate with fleshy appendage (photo: Ken Walker); T) Siphonostylis lazica, seeds angulose with testa surface covered with sessile glands (photo: Ken Walker). Scale bars in mm.

FIGURE 25. Habit and floral details. A) Chamaeiris anguifuga (photo: Jim Murrain); B) Dielsiris missouriensis (Baker 1881: t. 6579); C) Rodionenkoa gracilipes (Hemsley 1903: t. 7926); D) Lophiris cristata (Small 1924: t. 320).

FIGURE 26. Approximate distribution areas: A) Rodionenkoa (red); B) Lophiris (yellow).