Category: Compositae

  • Calico Aster (Aster lateriflorus)

    Aster-lateriflorus-2009-10-01-01

    These are the tiny and slightly sloppy-looking aster flowers that peek out from hedges and pop up in cracks of sidewalks in September and October. The buds of the disk florets are bright yellow, but they turn deep brownish purple as they open. Both colors are usually present at the same time, giving the plant its calico pattern.

    From Gray’s Manual: A. lateriflorus (L.) Britton. More or less pubescent, much branched ; leaves lanceolate or oblong-lanceolate, tapering or pointed at each end, sharply serrate in the middle; bracts of the involucre linear, acute or rather obtuse, imbricated in 3-4 rows. (A. diffusus Ait.) Thickets, fields, etc., very common from N. S. to Ont., and southw. Aug.-Oct. Extensively variable ; leaves larger than in either of the two preceding ; the involucre intermediate between them, as to the form of the bracts. Rays mostly short, white or pale bluish-purple.

  • Rayless Marigold (Bidens frondosa)

    Bidens-frondosa-2009-10-01-01

    Also known as Beggar-Ticks or Sticktight. It looks like a big single marigold from which someone has plucked off all the rays. As with Spanish Needles, the hooked seeds stick to animal fur or clothing. The species is variable, and Gray notes that it hybridizes even across genera. This plant grew at the edge of an alley in the South Side flats.

    From Gray’s Manual: B. Frondosa, L. (COMMON BEGGAR-TICKS, STICK-TIGHT.) Smooth or rather hairy, tall (2-6° high), branching; leaves 3-5 divided; leaflets mostly stalked, lanceolate, pointed, coarsely toothed; outer involucre much longer than the head, ciliate below; achenes wedge-shaped, 2-awned, ciliate (the bristles ascending except near the summit). —Moist waste places; a coarse troublesome weed, the achenes, as in the other species, adhering to clothing, etc., by their retrorsely barbed awns. Hybrids occur with Coreopsis aristosa and other species. July-Oct.

  • Purple-Stemmed Aster (Aster puniceus)

    Aster-puniceus-2009-10-22-Wexford-01

    UPDATED: An earler version of this post included a picture that was probably not Aster puniceus. Identifying asters is a fool’s game. Torrey & Gray’s Flora of North America lists 131 species of Aster, and the chances are good that the particular aster you’ve found by the roadside won’t exactly fit the description of any one of them. But this picture shows a plant that actually looks pretty much like what Aster puniceus is supposed to look like.

    Now Symphyotrichum puniceum, but the generic name Symphyotrichum is still so little known that most people looking for this plant will still know it as Aster. These common blue asters like slopes above streams and squishy wet ground. They are quite variable: Britton & Brown say that “races differ in pubescence, leaf-form, and leaf-serration,” meaning that anything you say about the shape of the leaves or how rough or hairy they are has to be followed by the words “or not.” The leaves of these plants were rough and sandpapery, and the stem quite hairy. These grew on the bank of a brook near Wexford.

    From Gray’s Manual of Botany: A puniceus, L.  Stem tall and stout 3-7° high, rough-hairy all over or in lines, usually purple below, panicled above; leaves oblong-lanceolate, not narrowed or but slightly so to the auricled base, rough above, nearly smooth beneath, pointed; heads 4-6″ high, subsessile; scales narrowly linear, acute, loose, equal, in about 2 rows; rays long and showy (lilac-blue, paler in shade). —Low thickets and swamps, very common.

  • Spanish Needles (Bidens bipinnata)

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    This is one of those flowers that reward a close look. The flowers are like tiny marigolds, and indeed they’re sometimes called bur-marigolds. The seeds, long and narrow like marigold seeds, have hooks that stick in animal fur or people’s clothes. These grew at the edge of a yard in Beechview.

    From Gray’s Manual of Botany: B. bipinnata L. (SPANISH NEEDLES.) Smooth annual, branched; leaves 1-3-pinnately parted, petioled; leaflets ovate-lanceolate, mostly wedge-shaped at the base; heads small, on slender peduncles; outer involucre of linear bracts equaling the short pale yellow rays; achenes 4-grooved, nearly smooth, 3-4-awned, very unequal. Damp soil, R. I., westw. and southw.; occasional on ballast northw.

  • Frostweed (Aster pilosus)

    Aster-pillosus-2009-09-29-01

    Now Symphyotrichum pilosum. Covered with white flowers, this aster looks as though it might have been touched with hoarfrost; it also blooms well past the first frost, giving us at least two possible derivations of its common name. Also called Heath Aster. It blooms everywhere in Pittsburgh; these were found by a fence in Beechview.

    Asters are hard even for botanists to sort out. Gray and Britton & Brown give this as Aster ericoides var. pilosus; Britton & Brown note that “This species apparently hybridizes with A. paniculatus Lam. where the two grow together.”

    Here is Gray’s complete listing for A. ericoides: A. ericoides L. Smooth, 3-9 dm. high; the simple branchlets or peduncles racemose along the upper side of the wand-like spreading branches; lowest leaves oblong-spatulate, sometimes toothed ; the others linear-lanceolate or linear-awl-shaped; heads 6 mm. high or less; involucre hemispheric or campanulate; bracts often nearly equal, with attentuate or awl-shaped green tips. Dry open places, N. E. to Ont. , Minn., and southw. Aug.-Oct.

    Var. villosus T. & G. Similar, but the stem and generally the narrow leaves villous-hirsute. (Var. pilosus Porter.) Same range.

    Var. pringlei Gray. A low slender northern form, with few erect branches and rather small scattered mostly solitary heads. (A. Pringlei Britton.) Me. to Ont., s. to Mass, and Wisc.

    Var. platyphyllus T. & G. Stout; stem and branches densely white-villous ; leaves lanceolate or oblong-lanceolate, mostly pubescent ; heads as in the typical form, but larger. O. to Mich., Ill., and southw.