Arachnothryx secunda (Standl.) Borhidi

Rondeletia secunda Standley, Contr. U. S. Nat. Herb. 18: 141
1916.
Shrub, the branches slender, terete, reddish-brown, pilose or thinly tomentose when young but soon glabrate; stipules triangular-subulate, 4—5 mm. long, erect, brown, glabra te; leaves opposite, the petioles stout, 3-7 mm. long, thinly tomentulose or glabrate, the blades elliptic, ovate-elliptic, or oval-elliptic, 10-16 cm. long, 3.5-6.5 cm. wide, rounded to acutish at the base, subabruptly acuminate to long-attenuate at the apex, thin, green, obscurely tomentulose beneath when young but soon glabrate, the costa slender, prominent beneath, the lateral veins slender, 7-9 on each side, subarcuate, ascending at an angle of 45° or more; inflorescence terminal, cymose-paniculate, 6-7 cm. long and broad, lax, the peduncles slender, 4—6 cm. long, the flowers secund, sessile, and usually remote along the slender scorpioid branches; bracts small, linear, green, the bractlets minute, subulate; hypanthium obscurely tomentulose or glabrate; calyx-lobes 4, linear or spatulate-linear, 1-3 mm. long, obtuse, unequal, reflexed; corolla white, sparsely villosulous outside, the tube slender, 10-12 mm. long, naked in the throat, the 4 lobes rounded, 3-4 mm. long, spreading; anthers and style included; capsule globose, 3-4 mm. in diameter, reddish-brown; seeds numerous, minute, angulate, brown, punctulate.
Type locality: Forests around Puerto Obaldia, San Bias Coast, Panama, at an altitude of 50 meters or less.
Distribution: Known only from the type locality.

Arachnothryx secunda là một loài thực vật có hoa trong họ Thiến thảo. Loài này được (Standl.) Borhidi mô tả khoa học đầu tiên năm 1982.