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'''Harikasa''', is an erect or reclining shrub growing from 50 - 200cm tall with scarcely branched stems that often produce adventitious aerial roots. The leaves have spiny edges when the plants are growing in an open position, but can be totally spineless when growing in the shade. The plant is harvested from the wild for local use as a medicine and material for making soap.

{{Common names|kn=holechulliHolechulli, mullu Mullu chulli, tudechulliTudechulli|ml=painaschulliPainaschulli, payinnachulliPayinnachulli|sa=harikasaHarikasa, harikusaHarikusa|ta=arrumulliArrumulli, kaludaimulliKaludaimulli, uppukkarinirumulliUppukkarinirumulli, painaPaina-schulli|te=alasyakampaAlasyakampa, thude Thude chulli|hi=harcuchHarcuch-kanta, hargozaHargoza|en=Sea Holly}}

{{Leaf|Simple|Opposite|nodes Nodes with a pair of spines at the base of the petiole; stilt-roots arising from lower portion of stem. Leaves opposite-decussate, simple, 7-15 x 6-9 cm, variously shaped, elliptic, ovate-oblong, or ovate- lanceolate, narrowed at base, spinous at apex, glabrous, coriaceous, sinuately lobed and spinulose along margins, rarely entire; midrib prominent, lateral veins 4-12 pairs, estipulate; petiole usually 0.5-1 cm and rarely up to 2.5 cm long, terete. }}<ref name="Leaf"/>

{{Flower|Bisexual|Terminal or pseudo-axillary spikes|Bluish-violet|4|Flowers sessile, 3.5-x 3.5 cm across; bract 0.6-0.8 x 0.5 cm, ovate, acute, margin ciliate; bracteoles 2, conspicuous, partly covered by the bract, lanceolate, persistent. Calyx green, 4-partite, lobes glabrous, 12-15 x 1 mm, shortly connate in two opposite pairs, the outer pair larger. Corolla bluish-violet, 3 cm long with a short tube closed by basal hairs; upper lip obsolete, lower lip broadly 3-lobed to entire, recurved by the middle portion. Stamens 4, attached to the throat of corolla tube, didynamous; filaments 13-16 mm long, stout, curved, more or less flat; anthers aggregated around the style, c. 1.2 cm long, connectives thickly hairy, medifixed, bilobed, one lobe sterile, dehiscing longitudinally. Ovary 2-loculed; ovules 2 in each locule on axile placenta; style c. 2.7 cm long, slender, terete; stigma bifid. }}

{{Fruit|A capsule|3-3.5 x 1.3-1.6 cm||ellipsoid Ellipsoid or ovoid-oblong, glabrous, 3-3.5 x 1.3-1.6 cm, apiculate|seeds 4, compressed, orbicular, 1.3-1.5 x 1- 1.2 cm, supported on short-hooked retinacula.}}