In adult plants, stipes are nearly circular in section, adaxially
sulcate, with one deep groove, and abaxially rounded; below the epidermis there is a wide hypodermic zone of fibers, 8-10 layers thick and a leaf trace with 3 strands included in a massive parenchymatic central area (Fig.
The occipital furrow curves adaxially
forward to meet S1, giving a trapezoidal shape to LO.
6 cm, base oblique, apex acuminate, margin serrate, adaxially
green, sericeous (5-10-celled trichomes) with sparse setulose, white unicellular trichomes, abaxially green or reddish, red or deep purple in the apical 1/3 or 1/5 of the foliar area, sparsely sericeous and more dense on the main veins, 11 (rarely 7-14) veins on the larger side of the blade.
The most posterior glabellar furrow (S1) is forked, with the main branch extending inwards and strongly backwards adaxially
straight papillae, and fruiting pedicels glabrous or puberulent only adaxially
3 cm long, 10-16 cm wide, broadly elliptical or obovate, cuneate or rounded at base, flat or slightly revolute at margin, broadly obtuse or rounded and usually abruptly short-acuminate or apiculate at apex, adaxially
glabrate at maturity except often appressed-tomentose on midrib and lateral veins near base, abaxially densely and persistently tomentose with the hairs T-shaped with the long crosspiece straight or sinuous, apparently eglandular, the principal lateral veins 10-13 on each side of midrib, very prominent abaxially and sunken adaxially
in dried leaves; petiole 9-14 mm long, densely and persistently appressed-tomentose or sericeous, eglandular; stipules 1.
Most of the epidermal cells are papillose and are interspersed with few stomata, both adaxially
and abaxially (Figs.
Of the three known specimens, the two smaller have the prominent glabellar spines rather close adaxially
, resembling the older species (e.
Inflorescences interfoliar, erect to ascending, branched to one order, prophyll short, bicarinate, fibrous, hidden in leaf bases, peduncular bract prominent, rostrate, densely spiny adaxially
, glabrous abaxially, peduncle densely spiny, rachis shorter than peduncle, not spiny, rachis and rachillae covered with a dense wooly-white tomentum, rachillae entirely covered by staminate flowers, these shallowly sunken in pits, pistillate flowers directly inserted at the base of rachilla or directly on main rachis in between staminate rachillae and without evident connection with them.
Synapomorphies of the Aristolochioideae include: perianth differentiated into utricle, tube, and limb (character 25), adaxially
curved (26), stamens sessile (45) and fused to the stigmas into a gynostemium (43).
5) mm; when fresh, whitish; when dry, adaxially
green (almost invisible) and abaxially whitish-green.
8 cm, base oblique, shorter side acute, larger side rounded, apex acuminate, margin dentate, adaxially
green, reddishpilose (6-12-celled trichomes), abaxially green, reddish-pilose (6-12-celled trichomes) more dense on the veins, 12-13 veins on the larger side of the blade; smaller leaf in a pair sessile, lanceolate, 1.