Betula pendula Roth

TEPBAPHli <t> JI 0 P BI CCCP,
H3flABAEMLia BOTAHH^ECKHM HHCTHTYTOM hm. B. JI. KOMAPOBA
AKAflEMMH HAYK CCCP
4555a. Betula platyphylloides V. Yassil. sp. nova
B. alba var. latifolia (Tausch) Kry 1. 1909, <Dji. Ajit. 5 : 1247, quoad
plantas. — B. verrucosa var. truncata Kry 1. 1930, Oji. 3an. Ch6. 4 : 788.
Arbor mediocris, cortice glabro albo, ramis pendulis; ramuli hornotini
atro-cinnamomei, nudi, verruculis convexis resinosis et lenticellis ellipticis;
ramuli annotini nitidi, atro-castanei, nudi, epidermide in sicco solubili et
lenticellis ellipticis; ramuli 2—3-ennes atro-castanei, nitidi, lenticellis
lucidis rotundatis; gemmae ovoideae, nitidae, squamis marginibus breviter
ciliatis; folia subcoriacea, ramulorum fertilium 2.6—5.5 cm lg. et 2.5—
3.5 cm It., late ovata, apice attenuata, basi truncata, leviter cordata vel
rotundata, rarius late cuneata, marginibus biserratis, 4—5-costata, utrinque
nuda, glandulis punctatis resinosis munita; petioli 1—1.5 cm lg., nudi.
Amenta (2) 2.5—3.3 cm lg. et 0.6—0.8 cm in diam., patentia vel péndula,
pedicellis tenuibus curvatis nudis 0.5—1.3 cm lg.; interdum ex una gemma
2 (rarius 3) amenta excedunt; amenta later alia amentis mediis breviora;
bracteae 3.5—4 mm lg. et 3.5—4 mm lt., basi sublineares, lobis lateralibus
falcate deorsum curvatis, marginibus ciliatis, utrinque, praecipue externe,
pilis brevibus nitidis tectis, lobo medio triangulato, a lobis lateralibus
leviter diviso, marginibus ciliatis, utrinque pilis brevibus nitidis tecto;
nuculae 1.3 mm lg. et 0.7 mm lt., ellipticae aut obovatae, superne pilis
brevibus appressis rigidulis tectae; alae nuculis subduplo latiores, supe-
rne valde superantes, marginibus aciliatis.
Typus: Kazachstania Orientali s, distr. Ustj-Kameno-
gorsk, fontes sinistri fi. Kjujula, in palude salebrosa, 3 VII 1914, N° 193,
V. Vassiljevsky; in Herb. Inst. Bot. Acad. Sci. URSS (Leningrad)
conservatur.
Affinità s. A B. platyphylla Sukacz., cui affinis est, foliis subcoria-
ceis minoribus, basi squamarum breviore et nuculis minoribus valde differt.
H3flaBaeMHH MaTepnaJi OTJiEraaeTca ot rana Jinmb 6ojiee mojikhmh jihctb-
hmh, ho noflo6Hue 9K3eMnJiapH BCTpenaiOTCH no BceMy apeaJiy BHfla h, no-
BHffHMOMy, npeflCTaBJiHioT 6e3apeaJibHyio aKOJiorH^ecKyio $opMy. B. platy-
phylloides V. Vassil. pacnpocTpaHeHa b CeBepHOM Ka3axcTaHe, Ha »re
3anaflHO-Cn6HpcKOH hh3M6hhocth. Ha boctok OHa ^oxo^ht 30 CaHH bkjiiohh-
TeJiBHO. B. BacHJiteB.
Ka3axcKafl GGP, 6. TyprancKan o6ji. Go6p. M. KopoTKzñ
h 3. JleóefleBa. — Kazachstania, olim prov. Turgaica. Leg.
M. Korotky et Z. Lebedeva.
1913.
NEW YORK BOTANICAL GARDEN
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