WILDFLOWERS OF NEW MEXICO

 

Multiple 1–4-feet tall, leafy stems form rounded to arching, bushy plants covered with flat-topped to rounded arrays with 3–10 yellow flower heads per branch. The most widespread and common form, var. flaccidus, has a thick covering of white to gray-green, woolly hairs throughout, but var. monoensis is hairless; both have 8–13 ray yellow flowers around a yellow disk.


FLOWER: April–September. Clusters of 3/4-inch wide (20 mm) flower heads on the stem tips have 8–13 narrow, yellow petal-like ray flowers 3/8–3/4-inch long (10–20 mm); var. monoensis has ±21 phyllaries and var. flaccidus has ±13 phyllaries. Note the small leaf-like bractlets 1/2 the length of the phyllaries or longer beneath the flower head of the hairless var. monoensis. Bracklets absent or tiny in var. flaccidus.


LEAVES: Alternate, evenly distributed. Blades narrow, 1–4-inches long, with thread-like lobes along the midrib.


HABITAT: Dry sandy, rocky soils, grasslands, shrublands, roadsides, disturbed areas; desert grasslands and scrub, prairies, pinyon-juniper, ponderosa woodlands.


ELEVATION: 2,300–6,500 feet.


RANGE: AZ, CA, CO, NM, NV, UT, TX.


SIMILAR SPECIES: About 22 species of Senecio in NM, 2 others with thread-like leaves, both hairless. Broom Groundsel, S. sparticoides, has 5 rays and no or only tiny bracklets beneath the phyllaries. See key below.


NM COUNTIES: Statewide in low- to mid-elevation, arid habitats.


KEY to 3 species with thread-like leaves

1. Conspicious bracklets 1/2 the length of the phyllaries ... S. falccidus var. monoensis (hairless)

(1+) tiny or no bractlets ... (2)


2. Woolly-hairy leaves ... S. flaccidus var. flaccidus

(2+) Leaves hairless or nearly so ... (3)


3. Phyllaries ±8, rays 5 … S. sparticoides

(3+) Phyllaries ±13 … S. riddellii

THREADLEAF  GROUNDSEL  (RAGWORT)

SENECIO  FLACCIDUS

Aster Family, Asteraceae

Perennial herb

THE CONTENTS OF THIS WEBSITE ARE COPYRIGHTED AND CANNOT BE USED

WITHOUT PERMISSION OF GEORGE OXFORD MILLER

Stems and leaves of the common Senecio flaccidus var. flaccidus are covered with white-woolly hairs.

The hairless Senecio flaccidus var. monoensis has ±21 phyllaries . Bractlets (arrow) are 1/2 the length of the phyllaries or longer.

The woolly-hairy Senecio flaccidus var. flaccidus has no or only minute bractlets (arrow) below the ±13 phyllaries.

Leaves are divided into thread-like segments along the midrib.

HOME          SCIENTIFIC NAME          FAMILY NAME           SEARCH YELLOW          SEARCH RED          SEARCH BLUE


SEARCH WHITE         SEARCH CACTI         SEARCH LEAFLESS         GLOSSARY

RETURN

Email Me