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Mandevilla macrosiphon (Plateau rocktrumpet)
Bransford, W.D. and Dolphia

Mandevilla macrosiphon

Mandevilla macrosiphon (Torr.) Pichon

Plateau Rocktrumpet, Longtube Trumpet Flower, Flor De San Juan, Rock Trumpet

Apocynaceae (Dogbane Family)

Synonym(s): Macrosiphonia lanuginosa var. macrosiphon, Macrosiphonia macrosiphon, Telosiphonia macrosiphon

USDA Symbol: MAMA5

USDA Native Status: L48 (N)

This plant is 6-12 inches tall. The leaves grow close together on the stem. On some plants, they are almost round with broad scallops; on others they have entire margins with a point at the tip. All of them are fleshy with a covering of fine hair on both sides and prominent veins and midrib. A single flower grows at the end of a stem. The flower tube is 2-5 inches long gradually spreading to 5 creamy-white petal-like lobes; the whole flower is about 1 1/2 inches across.


From the Image Gallery

6 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb
Leaf Arrangement: Opposite
Leaf Complexity: Simple
Leaf Shape: Elliptic , Ovate
Leaf Margin: Entire
Inflorescence: Raceme
Fruit Type: Follicle
Size Notes: 6-12" in height.
Leaf: Petiolate, ovate-elliptic to suborbicular. (Bibref: 293)
Size Class: 0-1 ft.

Bloom Information

Bloom Color: White
Bloom Time: May , Jun , Jul , Aug , Sep
Bloom Notes: Flowers white or pink-tinged.


Native Distribution: Southwestern Texas and northern Mexico.
Native Habitat: Dry rocky or open slopes.

Growing Conditions

Water Use: Low
Light Requirement: Part Shade
Soil Moisture: Dry
Soil Description: Rocky, gravelly, limestone-based.


Use Ornamental: Aromatic, Perennial garden, Rocky hillside, Rock gardens
Conspicuous Flowers: yes


Propagation Material: Seeds


Bibref 293 - Manual of the Vascular Plants of Texas (1979) Correll, D. S. & M. C. Johnston
Bibref 318 - Native Texas Plants: Landscaping Region by Region (2002) Wasowski, S. & A. Wasowski
Bibref 248 - Texas Wildflowers: A Field Guide (1984) Loughmiller, C. & L. Loughmiller

Search More Titles in Bibliography

Additional resources

USDA: Find Mandevilla macrosiphon in USDA Plants
FNA: Find Mandevilla macrosiphon in the Flora of North America (if available)
Google: Search Google for Mandevilla macrosiphon


Record Modified: 2017-03-29
Research By: JAM

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