Siphocodon debilis is a tangled, winding shrublet with rough texture that grows to 35 cm in height. The leaves are reduced to ovate scales of about 2 mm in length, ascending close to or nearly adhering to the green stems.
The small distribution area of the plant is restricted to rocky and sandy fynbos slopes near Caledon and Hermanus.
The generic name is derived from the Greek words siphon meaning tube or pipe and codon meaning crier's bell, referring to the corolla shape. The specific name debilis is a Latin word meaning frail or weak, referring to the delicate appearance of the plant.
This small genus of the Campanulaceae family has another species growing in the Caledon area, viz. S. spartioides that has wiry stems and blue or purple flowers (Bean and Johns, 2005; Burman and Bean, 1985; Andrew, 2012).