radiculan.

1725 J. Douglas Lilium Sarniense 8 From the..Heart of the Root..arise eight, ten, or sometimes twelve pretty large Radiculæ or Fibræ of a white Colour.

1770 C. Milne Bot. Dict. at Corculum The essence of a seed... It consists of two parts, termed by Linnæus Plumula, and Rostellum. The former is the radicula of Grew, and other naturalists.

1792 W. Bartram Trav. N. & S. Carolina (new ed.) 128 It is a jointed decumbent grass, sending out radiculæ at the joints into the earth, and so spreads itself, by creeping over its surface.

1836 J. C. Loudon Encycl. Plants (rev. ed.) 537 Cotyledons incumbent, folded together, or plaited lengthwise through their middle, and enwrapping the radicula.

1920 Bot. Gaz. 70 447 The seeds..are subglobose with the radicula almost straight.

1984 New Phytologist 97 683 Germination was recorded daily, and was regarded as having taken place after the radicula emerged from the achene.

2000 Biol. Chem. 381 700/2 The data suggest a high expression of the methyl cycle enzymes in radiculas and hypocotyls, but not in cotyledons.

1760 J. Lee Introd. Bot. 162 Radicula, the Radicle, is the fibrose Part of the Root which terminates the descending Caudex.

1796 T. Martyn Lang. Bot. (ed. 2) Radicula, a Radicle or Fibre.

1814 J. E. Smith Introd. Physiol. & Syst. Bot. (ed. 3) xii.79 The root consists of two parts, Caudex the body of the root, and Radicula, the fibre.

1829 T. Castle Introd. Systematical & Physiol. Bot. ii. 21 In many plants the root is systematically divided into two parts, the Caudex or great root and the radicula or rootlet.

1909 M. E. Latham in F. W. Rolt-Wheeler Science-hist. of Universe VII. ii. i. 211 The ‘caudex’ answers pretty nearly to the modern primary root and rhizomes, the ‘radicula’ to what is now called secondary roots.