HabitHerbaceous tuber-bearing perennials 0.8 m tall. Stems 2-4 mm in diameter at base of plant.
Sympodial StructureSympodial units typically 3-6-foliate.
LeavesPseudostipules to 7-20 mm long, lunate. Leaves odd-pinnate, (3-) 5-15 (-30) cm long, 5-8 cm wide, pilose with simple and glandular hairs abaxially and abaxially; petioles 2.5-4.2 cm long; lateral leaflet pairs (1-) 2-3 (-4), the size of the lateral leaflets diminishing abruptly towards the base of the leaf; most distal lateral leaflets 1-10 cm long, 1-5 cm wide, ovate to ovate-lanceolate, apex acute to obtuse, base cordate, rounded, oblique to slightly truncate, sessile to petiolate with petiolules up to 5 mm; terminal leaflet 3-12 cm long, 1.5-6 cm wide, ovate-elliptic to elliptic-lanceolate, apex acute to acuminate, base cordate, rounded, cuneate, or oblique; interjected leaflets 0-2.
InflorescencesInflorescence a dichasially branched, ebracteate, monochasial or dichasial cyme, 2-3 forked, generally in the distal half of the plant, with 3-20 flowers, all flowers perfect, peduncle 1-11.5 cm long; pedicels 20-30 (-44) mm long, articulate between the proximal ¼ and the distal ¼.
FlowersFlowers with the calyx 5-6 mm long, lobes elliptic, apiculate, acumens 1-2 mm long. Corollas 2-2.5 cm in diameter, stellate, without acumens, edges of corolla flat, not folded dorsally, white with tones of violet on the abaxial side of the lobe tips. Anthers 5-6 mm long, connate, yellow, apically poricidally dehiscent and often maturing to a short introrse apical slit, filaments 1-4 mm long. Ovary with style 10-13 mm long, exceeding stamens by 2.5-4 mm, straight, with stigma globose.
FruitsFruits 1 cm in diameter, globose, light green throughout.
SeedsSeeds from living specimens green-white throughout, ovoid, ca. 2 mm long, with a thick covering of “hair-like” lateral walls of the testal cells that make the seeds mucilaginous when wet. Removal of these hair-like lateral walls by enzyme digestion reveals a honeycomb pattern at their base.
Catalog Number: US 453965
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Preparation: Pressed specimen
Collector(s): J. N. Rose & J. S. Rose
Year Collected: 1906
Locality: Near Querétaro., Queretaro, Mexico, North America
- Isosyntype: Bitter, F. A. G. 1912. Repert. Spec. Nov. Regni Veg. 11: 442.
Life History and Behavior
Molecular Biology and Genetics
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