Chaenorrhinum minus (L.) Lange - Dwarf Snapdragon

Chaenorrhinum minus plant
Cigarette butt left for scale.

Family - Scrophulariaceae

Stems - To 30cm tall, erect, herbaceous, from single taproot and fibrous roots, glandular pubescent, branching, slightly "zig-zag" in appearance.

Chaenorrhinum minus stem

Leaves - Lowest leaves opposite to sub-opposite, spatulate, glandular pubescent, entire, purplish abaxially. Main leaves alternate, entire, sub-acute, 1-1.5cm long, 1-5mm broad, glandular pubescent, purplish below, tapering at base to a short petiole.

Inflorescence - Single axillary flowers. Pedicels erect, glandular pubescent, 1-1.4cm long.

Flowers - Corolla zygomorphic, 6-7mm long including spur, bilabiate. Upper lobe notched at apex, glandular pubescent, 3mm broad. Lobes rounded. Lower lip 3-lobed. Lobes rounded, 1-1.5mm long. Spur to 2mm long, purplish. Throat of corolla nearly closed by a saccate appendage of the lower lip. Corolla glandular internally, dark purple on lower lip internally. Stamens 4, didynamous, adnate at base of corolla tube, included. Filaments white, mostly glabrous but with glandular hairs at base, longest to 4mm long. Anthers pale yellow to white with dark purple also, -1mm long. Ovary superior, glandular pubescent, green, 1mm long, 2-locular. Placentation axile. Ovules many. Style 2mm long, purple, sparsely glandular pubescent at the base. Stigma exserted from one side of the style. Sepals 5, distinct, green, glandular pubescent externally and internally, 2-4mm long, 1mm broad, sub-acute, linear to linear-oblanceolate. Capsule glandular pubescent, 5mm long, apically dehiscent and tan upon drying.

Chaenorrhinum minus flower

Chaenorrhinum minus calyx

Chaenorrhinum minus calyxCalyx.

Chaenorrhinum minus capsuleRipening capsule.

Chaenorrhinum minus fruitDehisced capsule.

Flowering - June - September.

Habitat - Railroads and waste places.

Origin - Native to Europe.

Other info. - This species can be found in the northern half of the state. This small species is often overlooked because of its small size, however, the flowers are quite striking and interesting. C. minus is easy to ID in the field because of its distinctive flowers, small size, and glandular pubescent stems. It was first found in Missouri in 1947.

Photographs taken in Marquette, MI., 7-27-02.


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