petiolulen.
/ˌpɛtɪˈəʊljuːl/, /ˌpiːtɪˈəʊljuːl/, U.S. /ˌpɛdiˈoʊlˌjul/ Botany.
The stalk of a leaflet of a compound leaf.
ΘΚΠ
the world > plants > part of plant > leaf > petiole or leaf-stalk > [noun]
footstalk1562
leaf stalka1671
petiolus1707
petiole1753
petiolule1792
subpetiole1827
stalklet1835
phyllodium1840
phyllode1848
1792–4 T. Martyn Flora Rustica III. §95 The root-leaflets are on short petiolules.
1832 J. Lindley Introd. Bot. i. ii. 94 In all truly compound leaves the petiole is articulated with each petiolule.
1861 R. Bentley Man. Bot. i. iii. 173 The divisions of the petiole..are then called petiolules, stalklets, or partial petioles.
1960 K. Esau Anat. Seed Plants xix. 284 Certain plants have joint-like thickenings, the pulvini, at the base of the petiole and also at the bases of the petiolules in compound leaves.
1997 Brittonia 49 380 Leaflets subcoriaceous, abaxially shiny, drying black, the petiolule 4-5 mm long.
Derivatives
ˈpetioluled adj. borne upon or having a petiolule.
ΚΠ
1894 Bull. Torrey Bot. Club 21 303 Leaflets..more or less apiculate by the excurrent midrib, very short petioluled.
1910 H. H. Haines Forest Flora Chota Nagpur 479 V[itex] Negundo..Lfts. lanceolate entire or crenate glabrate above 2–6″, lateral sessile or shortly petioluled, other petiolules ½-1″.
1990 Bot. Gaz. 151 540/1 Fused and winged compound leaves are intermediate toward the evolution of truly free pinnately arranged petioluled leaflets in a compound leaf.
This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).
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n.1792