Zârna
Solanum nigrum
Buruiana anuala, care se inmulteste prin seminte, cu radacina pivotanta scurta. Iubeste solurile bogate in humus si azot, afanate. Este indicatoare de azot.
Epoca de germinare: Primavara tarziu. Germineaza de obicei la adancimea de 0.5–1 cm.
Cotiledoane: Larg-ovale, cu varful fin alungit, cu margini intregi, petiolate, paroase, cu nervura principala vizibila.
Frunzele adevarate: Ovale pana la oblonge, dantelate pe margine, usor paroase, petiolate, verde mat intens, cu nervura principala vizibila.
Tulpina: Taratoare sau inclinata, ramificata, presarata cu perisori scurti, colorata usor violet ca si petiolurile frunzelor, cu inaltime pana la 50 cm.
Floarea: Alba, stelata, sunt reunite mai multe flori pe tije scurte (asemanator cu florile la cartof).
Perioada de inflorire: (iunie) iulie – toamna
Seminte pe planta: 500 (100 – 1000)
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