A new nothospecies in the genus Potentilla L. (Rosaceae)

Abstract

The morphological, ecological and chorological features of a new hybrid from Poland are described and illustrated. The morphological characteristics of the new nothospecies Potentilla x gabarae Kolodziejek are compared with those of related species.

Full text

Acta Bot. Croat. 68 (1), 147–151, 2009 CODEN: ABCRA 25
Short communication ISSN 0365–0588
A new nothospecies in the genus Potentilla L. (Rosaceae)
JEREMI KOLVODZIEJEK*
Department of Geobotany and Plant Ecology, University of LVódzb, Banacha 12/16,
90-237 LVódzb, Poland
The morphological, ecological and chorological features of a new hybrid from Poland are
described and illustrated. The morphological characteristics of the new nothospecies
Potentilla ´gabarae Kolodziejek are compared with those of related species.
Keywords: Rosaceae, Potentilla, hybrid, morphology, taxonomy
Introduction
During an expedition to Czezstochowska Upland, Poland, in June 2003, the author found
five specimens (from the same plant) of Potentilla that differ from congeners in Poland and
the neighbouring countries.
Material and methods
After a morphological study, literature searches (WOLF 1908, SZAFER and PAWLVOWSKI
1955, SOJÁK J. 1995, GERSTBERGER 2002, KURTTO et al. 2004) and examination of many
species, the author concluded that it represents a new nothospecies, a hybrid of P.
leucopolitana P. J. Müll. and P. incana P. Gertner, B. Meyer et Scherb.
Results and discussion
Potentilla ´gabarae Kolodziejek, nothosp. nova = P. leucopolitana P. J. Müll. ´P.
incana P. Gertner, B. Meyer et Scherb (Fig. 1).
Type: Poland. Czezstochowska Upland: Jaroszów village near Zarki 50°39’21”N/
19°21’32”E, thermophilous grassland, 21.VI.2003, J. KOLVODZIEJEK (holotype LOD).
Habitu et indumento inter parentes media. P. leucopolitana foliolis supra plerumque
dense sericeo-pilosa vel cano-tomentosa, subtus cano-tomentosa. P. incana foliolis densis-
sime stellato-tomentosa et cinerascentia, supra parce pilosa vel subglabra et viridia.
Caules basi ascendentes vel suberecti (14.2–)15.4(–16.7) cm longi raro longiores,
ramis paniculato-corymbosis multifloris. Folia basalia et caulina inferna 5–7-nata, folio-
lis plerumque 1.5–2 cm longis, basi longe cuneatis, antice breviter late obovatis multi-
ACTA BOT. CROAT. 68 (1), 2009 147
* Corresponding author, e-mail: kolo@biol.uni.lodz.pl
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dentata, dentibus utrinque 4–5 obtusis aequalibus. Dens terminalis foliorum (1.8–)2(–2.3)
mm longis non aut parum prominens. Folia caulina media 5–nata; folia caulina supera
3-nata. Pagina inferior foliolorum cana, plerumque parce pilosa, subtus dense tomentosa;
pilis crassiusculis rectis et imperfecte stellatis composito obtecta. Flores numerosi, cymosi,
5-partiti, 8–10 mm lati. Petala luteola,(3.2–)3.6(–3.9) mm, obovata Sepali externi (2.7–)
2.9(–3.2) mm longi, acuto-elliptici, pilis flexuosibus dense villosi. Stamina 20 antheris
parvis subrotundo-ovatis. Carpella valde numerosa, stylus non typice coniformis basi
papilloso-incrassatus. Floret VI–VIII.
148 ACTA BOT. CROAT. 68 (1), 2009
KOLVODZIEJEK J.
Fig. 1. Potentilla ´gabarae (from holotype).
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Description:Flowering stems (14.2–)15.4(–16.7) cm, lateral; glabrous to white-to-
mentose. Stock with a terminal rosette of leaves during flowering. Leaves digitate; leaflets
5–7, (18–)20(–24.2) ´(9.4–)9.9(–10.3) mm, oblong-obovate with 4–5 teeth; terminal tooth
of leaflet (1.8–)2(–2.3) ´(1.5–)1.8(–2.2) mm, smaller in size than adjacent lateral (2.8–)3
(–3.2) ´(1.7–)1.8(–1.9) mm. Cauline leaves with 5 leaflets (7.6–)9.1(–12.1) ´(3.4–)4.5
(–5.3) mm with 2–3 teeth; terminal tooth of leaflet (1.2–)1.5(–1.9) ´(0.8–)1.1–(–1.4) mm,
smaller in size than lateral (1.7–)1.9 (–2.5) ´(1.5–)1.7(–1.8) mm. Leaflets sparsely
sericeous hairy with numerous unicellular imperfect hairs, having a variable number of
arms (3–7) radiating from a large basal cell. Flowers numerous, (7.8–)8.5(–9.9) mm in di-
ameter; sepals ovate (2.7–)2.9(–3.2) ´(0.4)0.5(–0.6) mm; epicalyx segments linear-lan-
ceolate (1.7–)2.1(–2.4) ´(0.4–)0.5(–0.6) mm, shorter than sepals; petals (3.2–)3.6(–4.2) ´
(1.8–)2.3(–2.9) mm, only slightly longer than sepals. Stamens (19–)20; carpel styles 30,
longitudinally filiform-elongated, i.e. from the middle up to the stigma equally thick.
Achenes ovate, laterally flattened. Apex obtuse, curved, base obtuse. Surface dull, gla-
brous, strongly rugose-ribbed, between ribs reticulate. Interspaces wider than ribs; ribs ca
10 mm wide and 10 mm high. The style scar is well above the middle of the achene (subter-
minal), notch prominent ca. 60 mm deep. Attachment scar subbasal, without aril, 40 mm
long and 30 mm wide. Dorsal margin with a ridge 10 mm high. Ventral suture 40 mm long
and 10 mm wide. Colour pale brown. Size: 0.84–1.20 (0.97±0.13) mm long, 0.61–0.80
(0.64±0.09) mm wide, 0.59–0.87 (0.67±0.11) mm thick. Flowering: V–VI, fruiting: VII–
VIII.
ACTA BOT. CROAT. 68 (1), 2009 149
A NEW NOTHOSPECIES IN POTENTILLA
ABCDEFG
ABCDEFG
A
B
C
D
E
F
G
A
B
C
D
E
F
G
Fig. 2. Distribution of Potentilla ´gabarae – cartographic square in Poland ATPOL (ZAJAC 1978).
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Distribution: The rare species occurs in a restricted number of localities in Poland, i.e.
only on the Czestochowska Upland, in the vicinity of Jaroszów and Zaborze village (Fig.
2). In Zaborze, the nothospecies occurs in mixed populations with Acinos arvensis,
Brachythecium albicans,Carlina vulgaris,Centaurea stoebe,Cladonia sp., Clinopodium
vulgare,Dianthus carthusianorum,Euphorbia cyparissias,Festuca ovina,Lolium peren-
ne,Origanum vulgare,Peucedanum oreoselinum,Plantago media, Poa compressa,Poten-
tilla incana,P. leucopolitana,P. tabernaemontani,Scabiosa columbaria,Sedum acre,
Stachys recta,Thymus serpyllum,Trifolium arvense. This type of vegetation can be classi-
fied as Origano-Brachypodietum Medw.-Korn. et Kornasb1963.
150 ACTA BOT. CROAT. 68 (1), 2009
KOLVODZIEJEK J.
Fig. 3. A – leaf ultrastructure morphology (from holotype), upper leaf surface; B – imperfectly
stellate hairs, lower leaf surface; C – lower leaf surface; D – achene of outline ovoid, later-
ally flattened; E – surface of achene strongly rugose-ribbed; F – close up of achene surface
between ribs with thick-walled reticulate microsculpture.
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Etymology: The species epithet honours Professor Barbara Gabara, Lódz, for her con-
tribution to the knowledge of the plant anatomy and embryology.
Further specimens examined: Czezstochowska Upland: Zaborze near @arki 50°40’31”N/
19°20’00”E, 333 m, thermophilous grassland, 3 June 2003, 17 July 2007, 14 June 2004, 30
June 2004 (J. KOLVODZIEJEK LOD).
Affinities:P. ´gabarae resembles P. leucopolitana in having dense tomentum and
leaves with 5–7 leaflets. However, there are many differences that render identification
easy. The former has numerous incomplete stellate hairs on the upper side of leaves, termi-
nal tooth of leaflet smaller in size than adjacent lateral and smaller leaves and flowers. P. ´
gabarae also resembles to some extent Potentilla incana and P. ´subarenaria Borbás ex
Zimmeter by having stellate hairs. Leaves of P. incana are covered with stellate hairs mixed
with long hairs which make the plant greyish; P. ´subarenaria, which is considered to be
of hybrid origin (P. incana ´tabernaemontani Ascherson), has curved and stellate hairs on
the surface. The stellate hairs of P. incana, which were described by WOLF (1908) as
»Sternhaare«, may consist of up to 30 identically long rays, while those of P. ´subarenaria
have about 10 or less identically rays. Leaflets of P. ´gabarae are covered with straight and
crispate hairs mixed with imperfectly stellate hairs which make the leaves sparsely
sericeous hairy; the imperfectly stellate hairs (»Zackenhaare«) consist of up to 7 not identi-
cally long arms (Fig. 3 A, B).
References
GERSTBERGER, P., 2002: Potentilla L. In: CONERT, H. J., HAMANN, A., SCHULTZE-MOTEL,
W., WAGENITZ, G. (eds), G. Hegi: Illustrierte Flora von Mitteleuropa 4(2C), 109–205.
Blackwell, Berlin.
KURTTO, A., LAMPINEN, R., JUNIKKA,L., 2004: 13. Rosaceae (Spiraea to Fragaria, excl.
Rubus). In: KURTTO A., LAMPINEN R., JUNIKKAL. (eds.), Atlas Florae Europaeae. Distri-
bution of vascular plants in Europe 13. Rosaceae (Spirea to Fragaria, escl. Rubus). The
Committee for Mapping the Flora of Europe Societas Biologica Fennica, Vanamo, Hel-
sinki.
SOJÁK, J., 1995: Potentilla L. In: SLAVIK, B. (ed.), Flora of the Czech Republic 4, 283 – 314.
Academia, Praha.
SZAFER, W., PAWLVOWSKI, B., 1955: Potentilla L. In: SZAFER, W., PAWLVOWSKI, B. (eds.),
Flora polska 7, 96–143. Wydawnictwo Naukowe PWN, Warszawa-Kraków.
WOLF,T., 1908: Monographie der Gattung Potentilla L. Bibliotheca Botanica 71, 6 + [1]+
714 + 2 maps.
ZAJAC,A., 1978: Atlas of distribution of vascular plants in Poland. Taxon 27, 481 – 484.
ACTA BOT. CROAT. 68 (1), 2009 151
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