What is "rat-tailed radish"

Radish \Rad"ish\ (r[a^]d"[i^]sh), n. [F. radis; cf. It. radice, Pr. raditz: all fr. L. radix, -icis, a root, an edible root, especially a radish, akin to E. wort. See Wort, and cf. Eradicate, Race a root, Radix.] (Bot.) The pungent fleshy root of a well-known cruciferous plant ( Raphanus sativus); also, the whole plant.

Radish fly (Zo["o]l.), a small two-winged fly ( Anthomyia raphani) whose larv[ae] burrow in radishes. It resembles the onion fly.

Rat-tailed radish (Bot.), an herb ( Raphanus caudatus) having a long, slender pod, which is sometimes eaten.

Wild radish (Bot.), the jointed charlock.