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Perennial herbaceous plants. The stems at the base thickened in round tubers with numerous spirally arranged leaf sheaths without leaf lamina and 2 - 3 sagittal or lanceolate leaves on long, thin stems, which basically expand in vaginas. Up leafless stems. Female flowers, consisting of a single station pistils, located at the bottom of the inflorescence. Male flowers composed of 1 stamen with 3 - 4 anthers, are more than females. Between male and female flowers, and over the past ± numerous sterile. flowers in the form of filamentary at the base expanded, conical, rolled appendages. Inflorescence ends with ± extended swatter-like or cylindrical appendage. The cover basically ovoid pipe-like covering completely inflorescence, up funnel, dissolving in an open plate. The fruit juicy strawberry. In the growth of fruits veil is torn and falls.

Table for determining the types 1   Tubers disc-shaped, flattened round. Stems and leaves develope of indentation in the middle of tubers. Sterile flowers located between male and female flowers arranged in 3 - 4 rounds ................................................................................................ .. 2. Aronstab, Arum palestinum, … - A orientate MV 1* Tubers ovoid or cylindrical. Stems and leaves grow from the tubers bumps. Sterile flowers, arranged between male and female flowers arranged in only two rings …………….............................................................................................................................................................................………........ 2 2  Swatter-like appendage of inflorescence narrowly linear, up to 3 mm wide. Leaves uniformly colored or. dark spotted ............................................... .......................................................................................................................................................3. Snake’s head, Adder’s root, ... - A maculatam L. 2* Swatter-like appendage of the inflorescence usually cylindrical - wide 5 mm or more. Leaves light white spotted or net whitish ....................................  ....................................................................................................... ....................................1. Italian aruum, Italian lord’s-and-lady’s  - A italicum Mill. From "Флора на НР България", том II, БАН, София, (1964)

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Arum is a genus of flowering plants in the family Araceae, native to Europe, northern Africa, and western and central Asia, with the highest species diversity in the Mediterranean region.[1][2] Frequently called "arum lilies", they are not closely related to the true lilies Lilium. Plants in the closely related tribe Zantedeschia are also called "arum lilies".
They are rhizomatous, herbaceous perennial plants growing to 20–60 cm tall, with sagittate (arrowhead-shaped) leaves 10–55 cm long. The flowers are produced in a spadix, surrounded by a 10–40 cm long, coloured spathe, which may be white, yellow, brown or purple; some species are scented, others not. The fruit is a cluster of bright orange or red berries.
All parts of the plants including the berries are poisonous,[3] containing significant amounts of calcium oxalate as raphides.
The genus name is Latinized form of the Greek name for these plants, aron.

From Wikipedia, the free encyclopedia

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References: "Флора на НР България", том II, БАН, София, (1964), Wikipedia, the free encyclopedia

Distribution in Bulgaria: (Conspectus of the Bulgarian Vascular Flora) = conspectus&gs_l= Zlc.
Distribution:

SPECIES:

Arum maculatum L. - Snakeshead, Adder's root, ...

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