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Aristolochia watsonii Wooton & Standl.
Name
Watson's Birthwort
Habit
perennial, scrambling geophyte < 0,8 m, tuberous taproot
Inflorescence
2-3 cm, odour barely noticeable
Origin
USA & Mexico
Seeds
thick-shelled, flat, perfectly triangular, small elaiosome
Aristolochia watsonii seems to constitute the northernmost representative of the odd Mexican subsection Pentandrae.
The very narrow, arrow-shaped and reddish coloured foliage is just one reason why this amazing little oddity definintely should become more common in cultivation.
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