I've been looking into this plant recently. So far as I'm aware there are three very similar orchids:
1. Den lindleyi - bulbs to a maximum length of around 2 1/2 inches, tend to be rounded at the leaf end (unless they've been starved of nutrients to encourage flowering), multiple blooms on spikes and flowers to about 1 inch diameter;
2. Den lindleyi var majus - longer bulbs than Den lindleyi (4 inches plus), appear to be more pointed on the end, multiple blooms on spikes and flowers over 1 inch - not sure how large, but larger than lindleyi, still waiting for mine to flower;
3. Den jenkinsii - a mini, looks extremely similar to Den lindleyi var majus but bulbs only to about an inch high, small spikes with 2-3 flowers the same size as the blooms on Den lindleyi. A mini-aggregatum.
So for an ID on this, size IS important...
If anyone thinks the foregoing is incorrect, please set me straight, it's just my understanding on the aggregatum group.
Cheers,
Aus.
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